Full diagnostics of your MacBook can only be done at a service center. DIY MacBook repair: troubleshooting instructions

Any device, regardless of its complexity, requires a preventive inspection from time to time in order to promptly track emerging problems, eliminate them in time at their inception stage and prevent recurrence. Despite the fact that Macs (both desktop and mobile) are famous for their reliability, they should also undergo preventative maintenance from time to time. Mac OS X contains many various settings and temporary elements, both at the software and hardware levels, which can affect the operation of the system as a whole and individual applications. We will talk about this in today's article.

We would like to warn you right away that not all of the tips below should be used in any case - some of them are recommended to be used only in case of obvious problems.

IRON PREVENTION

Maintenance of hardware by the user consists of working with PRAM and PMU settings, data from the boot volume of the disk and the partition table structure. If you have the proper user skill and experience in assembling and disassembling your Mac, you should regularly clean its insides from dust.

• Checking the primary disk partition

We reboot the computer, but boot not as usual, but from a recovery disk or from any other boot volume (installation DVD, backup copy main section, etc.). During the boot process (if using the installation DVD) or after full load, launch Disk Utility and, having selected the main partition with the system in it, we perform a disk check to find out if everything is in order with the structure of the disk file system. The same check can be done by booting in normal mode, but if you boot from another medium, the effectiveness of the check will be slightly higher.

• Apple Hardware Test

For any Mac, there is also an official tool for testing hardware for errors. It's called Apple Hardware Test and can be found in a variety of places:

• on installation disk with Mac OS X that came with your Mac (if you bought it with Leopard 10.5.4 or older)
• on the software disk that came with the Mac (if Mac OS X 10.5.5-10.6.8 was pre-installed on the Mac)
• on the Recovery partition or even on the Internet (if the Mac was sold with OS X Lion)

Depending on the Mac models, the way you run the test may vary. As a rule, to enter the test you need to hold down the D key when turning it on (not when rebooting!). If Apple Hardware Test is located on the Recovery partition of the disk, then use the Command+D combination.

If the D key doesn't change anything, try inserting the disks your Mac came with into the drive and holding it down when the computer turns on with a DVD in the drive.

If Apple Hardware Test finds any errors, it will be very important to remember (or better yet, write down) their codes. This will be useful to you when communicating with technical support.

If there is no other medium from which to boot, there is no need to bother with Disk Utility If you don’t want to either, you can boot your Mac in safe mode. This mode The good thing is that, among other things, with such a start, several system maintenance procedures will be launched and the disk will be forced to check for errors. In order to boot the original Mac in safe mode, the user just needs to hold down the key while booting. SHIFT , in case of using Hackintosh - boot with the flag -x .

• Resetting PRAM

PRAM is a parametric random access memory device that stores some settings operating system and devices to provide Mac OS X with quick access to them. The number and name of settings varies depending on the type of computer, as well as the devices and drives connected to it. But almost always, video and monitor settings are stored there (refresh rate and screen resolution, number of colors and some others), information about the starting disk volume, set speaker volume, data about the last kernel panic.

In some cases, clearing PRAM helps to cope with certain problems that have arisen. To clear PRAM, just hold down the keys when starting the computer COMMAND+OPTION+P+R (you need to press them before the gray screen appears) and do not release until the Mac boots up and you hear the Mac OS X welcome sound.

If you have a RAID array installed on your Mac, it may happen that after resetting the PRAM, the computer will refuse to boot correctly. In this case, you should try to boot while holding down the key OPTION to the screen for selecting a system to launch, and if this does not help, then restart the Mac by holding down the keys COMMAND+OPTION+SHIFT+DELETE .

• Reset SMC

An SMC module is a computer chip that is usually found on motherboard and is responsible for managing all aspects of the computer's power supply. It controls the speed of rotation hard drive, turning sleep mode on and off, charging, and the effect of connected devices on sleep mode. If you have problems with sleep mode, the inability to turn on the computer when running on battery power, and other power-related problems, then resetting the SMC settings can help solve them. For different Macs, the SMC reset process is slightly different, so to get reset instructions specifically for your Mac, we refer you to the Apple knowledge base, where everything is described in detail. As an example, here is the procedure for resetting the SMC for the MacBook Air and Mac Mini.

1. Turn off your MacBook and disconnect all cables from it.
2. Connect the network adapter cable to it.
3. Press and hold the keys CONTROL+SHIFT+OPTION on the left side of the keyboard (that's right), and then press and hold the power button.
4. After 5 seconds, release all buttons and press the power button again.

1. Disconnect all cables from the computer, including the power cord.
2. Wait 10 seconds.
3. Plug in the power cord while holding down the power button on the back of the computer.
4. Release the Power button.
5. Turn on your computer by pressing the power button again.

• Cleaning your Mac from dust

This procedure requires some experience and practice in analyzing and reassembly Maca. Despite its apparent complexity, the operation can significantly help in the fight against insufficient cooling of the computer case and components, because the Mac, like any other electronic equipment, is an excellent dust collector. Of course, not every Mac can be easily disassembled. You can find out how this is done and how difficult it is on the iFixit portal.

However, if you are not confident enough in your abilities, then it is better to clean your Mac from dust in service center.

PREVENTION OF THE SYSTEM

System prevention comes down to checking the status of rights to files and folders, cleaning various caches and removal of other debris.

• Verification and restoration of rights

It may be quite useful to check and, if necessary, restore access rights to files and folders. To do this, boot in normal mode from the main boot partition and start again Disk Utility, in which we perform the above operations.

• Extraordinary launch of the Mac OS X self-cleaning system

Mac OS X is enough smart system and it has a built-in self-cleaning system that independently removes various temporary files and other garbage. Everything would be fine, but there is one problem - the self-cleaning system starts at strictly defined hours, when computers Russian users as luck would have it, they are turned off. About how to solve this problem and independently start the self-cleaning process in detail in one of our articles devoted to working with the Terminal.

• Cleaning extensions and system cache in Mac OS X

If there are possible problems with drivers, cleaning system extensions can help, and cleaning system cache will help the system “breathe” more freely. Behind detailed description cleaning process also refer you to the above-mentioned article on working with the Terminal.

The final finishing touch to prevent the operating system is to restart the computer. Don't be surprised if your Mac takes too long to boot the first time after cleaning - this is normal. Reboot the machine again and it will boot normally.

Alternatively, to prevent the system, you can use various specialized applications, significantly facilitating this process and eliminating operations with Terminal, Disk Utility and other applications that frighten newcomers. We have already talked more than once on the pages of our website about similar programs, for example, about or .

Keep your Mac in order, take care of it regularly and it will repay you with many years of impeccable work;)

Determining the cause of the malfunction is the very first thing you need to start repairing your MacBook. And the point here is not that “this is how it should be,” but that replacing components in Apple laptops is a very expensive process, so you should be absolutely sure that it is really necessary.

Cost of services:

Problems that a MacBook user may encounter can be divided into two groups:

Software

They are related to incorrect installation and the work of the operating room Mac systems OS X or software. In this case, problems occur directly during or after working with an application or may occur with a certain frequency.

They are caused by a malfunction of laptop modules such as the MacBook motherboard, hard drive, matrix, etc., and in this case, repair or replacement of MacBook components will be required.

Stages of self-diagnosis of a MacBook: what you can do before contacting a service center

• If you exclude software glitch, the cause of the problem may lie in connected but malfunctioning equipment. Turn off the device and try to disconnect all external equipment, leaving only the mouse. If the laptop starts working normally, then further diagnostics of the MacBook will consist of alternately connecting the equipment and turning on the laptop. This way you can determine what exactly led to the problems.
• If this does not help and the laptop continues to work incorrect mode, it is worth checking the hard drive and also ruling out problems with access rights. To diagnose a disk in a MacBook, there are two programs - Disk Utility and the fsck command (the latter is used for MacBooks with OS X 10.4 or later early version). The check must be carried out in a safe mode.
• For Mac diagnostics Book with OS X 10.7 and later, you can use the Hardware Functional Test program, and for devices that went on sale in July 2013 or later, you can use Apple Diagnostics. In this case, it is very important to turn off all external equipment and also connect the laptop to the network.
• To enter the MacBook diagnostic mode, you need to hold down the D button after turning on the laptop. A gray screen will appear, and you will be able to launch a utility to check the hardware (you can select full check or partial). If the diagnostics are successful and the cause of the failure is identified, a message will be displayed with a record of the corresponding error.

Full diagnostics of MacBook - only at the service center

The ability to independently diagnose a MacBook is, of course, wonderful, but a complete picture of the laptop’s performance can only be obtained by contacting a service center. For example, if the computer does not turn on or maintenance has not been carried out, the cooling system has failed, the battery or charger is damaged, it will be possible to determine the cause of the malfunction only after disassembling the laptop and testing the circuit. The MacBook will also need similar diagnostics if it has been dropped or flooded with liquid.

Disassembling an Apple laptop is not easy even for a specialist, so you shouldn’t try to open the case and get the components yourself. Contact the service center - and the MacBook will be thoroughly diagnosed, and the technician will be able to determine the exact cause of the equipment malfunction.

Check with the manager by phone for the exact price for repairs.

How much does it cost to replace a battery~ Anna ~ 05/25/2018

Good afternoon
My computer died when connected to an outlet (there was a spark and the adapter also died)... I think either the computer died completely or the battery (I hope for the latter, of course)). Tell me how much the diagnosis will cost, how much possible repairs and timing

Macsave Center Answer: Good afternoon, Laptop diagnostics are free with us, as a rule, laptop power circuit repairs range from 3500-6500 rubles

I reset NVRAM on Mac Air and now it won’t turn on~ Dima ~ 03/22/2017

I reset the NVRAM on the Mac air and now it won’t turn on when I press the Mac safe the sensor turns green and goes out

Macsave Center Answer: Dmitry, good afternoon!
There may be a problem with the board. The device needs to be diagnosed. Bring it, we'll see. Diagnostics are free.

Poppy freezes ~ Enakentiy ~ 09-03-2017

Good afternoon I have a Mac Book Air A1466 2012 The problem is the following: when working with a Mac in normal mode, the touchpad works weakly and often does not respond to commands, secondly, when you leave any programs on and close the lid, or when the battery runs out and it turns off, then after opening or connecting to the network, the mouse cursor begins to float and does not respond to tasks until you forcefully close all programs that were open before. What could be the problem? Thank you in advance! I also tried to run system diagnostics by pressing the d button when turning it on, went into test mode after asking to connect to the Internet, but it couldn’t connect to the Internet because it doesn’t see my Wi-Fi router but sees all the others nearby, although in normal mode it works through a router without problems. Thank you in advance

Macsave Center Answer: Innocent, good afternoon!

USB does not work ~ Sergey ~ 02/13/2017

Good evening! Not USB operation on a MacBook Pro 2011. If you connect your phone, it charges it, but doesn’t see it, and if you connect a flash drive, it doesn’t see it either. I tried the hard drive: the indicator lights up, but is not found in the system. What could it be? Thanks in advance for your answer.

Macsave Center Answer: Sergey, good afternoon!
It is difficult to say remotely exactly what is causing the difficulties. The device needs to be diagnosed. Bring it, we'll see. Diagnostics are free.

Problem with sound through headphones ~ Vyacheslav ~ 01/31/2017

If you insert headphones while music is playing on the iMac, the sound continues to come through the speakers, in order for the iMac to see the headphones, for this you need to enter standby mode, and then exit it, and so on each time, so that you can hear the sound through the headphones. It's a software problem, as you understand?

Macsave Center Answer: Vyacheslav, good afternoon!
It is difficult to say remotely exactly what is causing the difficulties. The device needs to be diagnosed. Bring it, we'll see. Diagnostics are free.

MacBook Pro (13-inch, Late 2011)Intel 6 Series Chipset restarts without permission~ Arman ~ 01/05/2017

hello, I have a MacBook Pro (13-inch, Late 2011)Intel 6 Series Chipset:
Manufacturer: Intel
Product: 6 Series Chipset
Communication speed: 6 Gbit
Installed connection speed: 3 Gbit
Physical connection: SATA
Description: AHCI Version 1.30 Supported

Initially there was a Toshiba MK5065GSX 500 GB HDD, over time it filled up, I decided to change it to a seagate st2000lx001 2tb, after the replacement it periodically restarts without permission about once a day or once every two days, and also sometimes turns off making a 3 short beeps, did the diagnostics by holding D, found no errors, tried installing back the Toshiba MK5065GSX 500 GB, everything works without failures. I read on the Internet, some write that the temperature needs to be changed, tell me what it really could be, maybe a defective seagate st2000lx001 2tb? Thank you.

Macsave Center Answer: Good afternoon
It’s difficult to say from a distance exactly what the difficulty is. Bring it, we'll see. Diagnostics are free.

Overheating ~ Maxim ~ 04-01-2017

Good afternoon. I recently bought a used macbook pro 15 2012, not retina. I replaced the thermal paste and cleaned it from dust, since the computer was heating up, but did not conduct any tests with it: it warmed up even while surfing the Internet. After cleaning this problem disappeared. But recently I decided to run a performance test. And during the test CPU temperature In a few seconds it jumped up to 100 degrees. The coolers were just starting to spin, but I didn’t wait and turned them up to full power using Macs fan control. Looking deeper, I saw that Maximum temperature for GPU PECI and CPU PECI. What could be the problem?

Macsave Center Answer: Maxim, good afternoon!
The device needs to be diagnosed. Bring it, we'll see. Diagnostics are free. It is difficult to say remotely exactly what the reason might be.

MacAir 13 2011 periodically shuts down when you press Delete~ IVAN ~ 05-12-2016

Good afternoon I'm worried about the Mac randomly shutting down when I press Delete.

Macsave Center Answer: Ivan, good evening!
The device needs to be diagnosed. Bring it, we'll see. Diagnostics are free.

stuck~ Olga ~ 11/26/2016

Good morning, I have Mac pro Retina,(15-inch, Early 2013, 2.4 GHz processor Intel Core i7, OS X 10.8.5 software, Memory 8 GB 1600 MHz DDR3) began to write low hard disk space. I bought external drive to transfer photos. I leave it overnight, in the morning I see that the icon says the recording has stopped, i.e. some were recorded, but some were not recorded ---- 1) you need to rewrite all the photos from Ifhoto to your hard drive.
2) Also overwrite everything from the image folder
3) All folders from the desktop.
While I tried to do this myself, all the photos from the Images folder ended up in the trash, then I copied all the photos and tried to transfer them to an external drive, but they ended up on the desktop and Finder froze ( different ways I tried to complete this process, but it didn’t work) Finder and there are 1500 photos plus folders on the desktop. I need help. How much is it?

Macsave Center Answer: Olga, good afternoon!
The cost of cloning a system with data is 2500 rubles. Bring it, let's see what's the matter.

problem with macpro 2010 ~ Olga ~ 10/26/2016

Hello! The problem is this: the screen periodically goes blank during operation, but you can hear the processor working. goes out unexpectedly, and may not light up for several minutes and then work again. The monitor itself is fine - connected to the laptop - everything worked fine.

Macsave Center Answer: Olga, good afternoon!
It is necessary to diagnose the device. Remotely it is difficult to say exactly what is the cause of these difficulties.

The Mac slows down, but as soon as you connect it to power, everything is ok / MacBook Pro 13 2011~ Alexey ~ 10/21/2016

It started unexpectedly, the computer was not subject to any external damage! It slows down wildly, to the point of intermittent movement of the cursor on the screen, but the highlight is that as soon as you connect the Mac to the power supply, it comes to life before your eyes and everything works properly! But it’s worth noting that the overall speed of work is still not the same as before! Suspicions about the video card, but how does this depend on Power Consumption?
What is the reason and how bad am I?

Macsave Center Answer: Alexey, good afternoon!
It is necessary to carry out diagnostics and look at the device. It may be enough to clean the cooling system. Bring it, we'll see.

Full charge cycle 20 hours ~ Alexander ~ 09/16/2016

I have a MacBook Air 13. I got it, one might say, by inheritance. The battery only has about 300 charge cycles. On this moment cycle fully charged about 20 hours. Tell me what this is connected with and what to do?

Macsave Center Answer: Alexander, good afternoon!
It is necessary to diagnose the power supply circuit and possibly replace the battery.

MacBook slows down ~ Vladimir Pavlenko ~ 01-09-2016

Hello! I have the same problem, I went to an event that took place outdoors! There was no stationary electricity, the organizers had a 6.5 kW gas-electric generator, I had to charge my MacBook from it! the next morning I put the MacBook on charge and discovered that the charging indicator lights up for a second when connected and that’s it, charging doesn’t happen, the screen shows that the battery requires maintenance. I found on the net that if I press a key combination, I don’t remember which battery should work! helped! Charging is now on! The indicators are still on as before! BUT IT BECAME TERRIBLY STUPID. Tell me what could be the problem! Mak beech model MD 101 2012! Even while I’m writing to you, it keeps getting down!

Macsave Center Answer: Vladimir, good afternoon!
IN in this case The battery needs to be replaced! Check the device model.

After closing the lid, the macbook a1342 does not turn on or start ~ Andrey ~ 08/25/2016

Good day. I was working on a Mac - we were taking pictures in a photo booth - I closed the lid, drank tea - I opened it - and nothing happens - it doesn’t start from sleep mode, I connected the Magsafe - at first it was green, then red - the white diode does not react. Didn’t subject him to mechanical influences, didn’t spill any liquid - nothing - he died in the same place,

Macsave Center Answer: Andrey, good evening!
In this case, it is necessary to carry out diagnostics to identify the causes of these difficulties (motherboard power circuit/ north bridge). Bring it, we'll see. Diagnostics are free.

Macbook pro 17 won't start ~ Marat ~ 08/13/2016

Hello.
The computer was left in sleep mode overnight. Didn't start in the morning. Coolers do not start. But there is a loading wheel and a slider. At 100% load the computer simply turns off. What could be the problem?

Macsave Center Answer: Good afternoon. There may be a problem with the video card or hard drive. You need to do a diagnosis, it's free

Problems with exiting hibernation mode in Win7 Boot Camp~ Vitaly ~ 06/17/2016

Hello, I own a MacBook Pro 15 Late 2013, the hard drive was recently replaced at a service center, upon its return the laptop stopped coming out of hibernation mode, it just hangs with a black screen, I tried everything I found on the Internet on this topic, rolled back the drivers, disabled various features in nothing helped in power supply modes. I demolished the system, deciding that maybe the problem was there, after reinstalling the problem remained on clean Windows, of course, with the drivers installed, exactly the same thing happens, the music freezes when exiting hibernation mode, please tell me what to do and can you help?

Macsave Center Answer: Hello, you need to look / diagnose, come to us for a free diagnosis

Question about work MacBook keyboards Pro 2011~ Pavel ~ 06/15/2016

Good day!
I have a MacBook Pro 2011 Unibody. I clean it periodically and change the thermal paste. During the last thermal paste replacement (disassembly, removal of the motherboard), I inadvertently damaged (torn off) the touchpad cable. Having decided that before replacing it I would use the mouse, I assembled it, which in general is not the first time I’ve done it, and I discovered that the keyboard did not work either. After that, I disassembled and checked the keyboard cable a couple more times, but there was no result. The keyboard is silent. ((Tell me what could be the problem? Could the non-working touchpad on the example be somehow connected with the keyboard? Or maybe another option? And also how much does the cable for the touchpad, the keyboard and the cost of work cost?

Thank you!

Macsave Center Answer: Good afternoon, I need to diagnose, perhaps the problem is in the touchpad shorting cable or the connector and keyboard cable are also damaged, you need to look, the cost of replacing the cable is 4500 rubles since it comes with the touchpad. Our diagnostics are free.

turns off macbook air 11 A1465 ~ Vladimir ~ 09-06-2016

Hello, it turns off after connecting external drives via USB and Thunderbolt, there is no shutdown system: it can work for three minutes and five seconds, a flash drive in the USB connector does not turn off the computer, if the computer involuntarily turns off, you can turn it back on only by disconnecting the power supply, that is, from the battery

Macsave Center Answer: Good afternoon, I need to diagnose, maybe the problem is in the power circuit on the motherboard and when there is a lot of energy consumption on external devices, the MacBook turns off and blocks the BIOS. Diagnostics are free.

Cooler MacBook Air 2015~ Pavel ~ 08-06-2016

Hello!
MacBook Air, after six months of very gentle use, suddenly the cooler began to spin up to 6500 rpm. At the same time, the processor temperature, etc., is 28-31 degrees
Reboots, reset sms - no result. Works quickly and stably, only the cooler thrashes
What could it be and what should we prepare for?
Thank you!

Macsave Center Answer: Good afternoon, perhaps the problem is in the cooling system, if not, then bring it in for diagnostics

Problem with discrete monitor ~ Daniil ~ 05/31/2016

Hello, I have an MBP 13" late 2011, when connecting a second monitor via a Mini DP adapter - VGA image appears on it for a second and disappears. If you leave it like this for a minute, the Mac starts to slow down a lot and artifacts appear. If you manage to set the resolution to ~1360x780 on the second monitor, everything works fine and the monitor works (though sometimes it blinks, about once every 30 minutes). The problem is most likely not in the software (I checked both on OSX and on Windows via Boot Camp, reinstalled the OS) and not with the adapter (I checked it on MB 13" 2010, everything works fine in 1920x1080). What could be the problem? Also not The card reader works (the system sees it, but does not read the cards), which means the problem is not in the video card, but in the motherboard?

Macsave Center Answer: Good afternoon, apparently the problem is in the bridge, they have video and power management there

MacBook Pro 17 A1212 cooler does not turn off ~ Igor ~ 05/27/2016

Good afternoon I got a MacBook Pro 17 A1212, when I turn it on, the coolers turn on almost immediately and don’t turn off again, even when you reboot. The cooling system has been cleaned. Could it be the OS or does it need to come to you for diagnostics? I don’t know how it worked before, I didn’t have it. Thank you!

Macsave Center Answer: They all behave this way over time, it’s practically the norm.

card reader~ Alexey ~ 08-05-2016

Hello, the card reader in the 15" firmware 2011 does not work. It is in the list of devices, but it does not read cards. Is it possible to fix it and how much will it cost?

Macsave Center Answer: It is necessary to diagnose the TC, it is soldered to the motherboard

MacBook ~ Ella ~ 05-05-2016

Hello, I have the same problem. The MacBook started to fail, I restored it from previous version, but the spacebar key now prints =, and the shift key increases the volume. I completely reset the settings and set them to factory defaults, but the problem did not solve. What to do?

Macsave Center Answer: Good afternoon. Sometimes there is a keyboard cable or the keyboard itself fails, but first reinstall the system from scratch and without transferring data

The built-in keyboard does not work on the MacBook Pro (Retina, 13-inch, Early 2015)~ Vysilij ~ 04/03/2016

Good afternoon Can you tell me what the reason is? The keyboard on the MacBook Pro (Retina, 13-inch, Early 2015) works sometimes. Everything is fine with the computer, everything works properly, it has never been wet with water or fallen. When I hold the poppy from below and lightly press the bottom of the lid, the keyboard works, then I stop pressing, it stops working and tries to find the keyboard and touchpad (mouse) with using Bluetooth. What could be the problem? and how long will it take to fix it?

Macsave Center Answer: Good afternoon, perhaps there is no contact in the keyboard cable or the issue is in the track pad since the keyboard is powered through it, you need to diagnose

Mac 725RS/A won't boot~ Andrey ~ 03/19/2016

Hello!! This situation happened to me, I’ll describe it step by step. The Mac was turned on and in Opera mode two horizontal lines passed across the screen and the laptop froze, I rebooted it with the button and after that it no longer booted, that is, it turns on, the sound turns on, then the apple appears and in a circle it loads on a gray screen, after which the wheel loading disappears and the gray screen remains. I tried to boot in safe mode while holding Shift, the loading scale reaches halfway and disappears and a gray screen remains. I pressed Option and selected the OS installation disk, the loading wheel appears as if I turned on a Mac and disappears, but the screen becomes backlit black. Tell me approximately what it could be??

Macsave Center Answer: Good afternoon, apparently the video chip has failed, a common failure, replacement costs 10,000 rubles, but first we’ll diagnose

macbook pro 15~ Max ~ 11-03-2016

Good day! I've been struggling with the same problem for several weeks now: my computer turns off spontaneously. Previously, the picture froze and the Mac turned off, but now the screen is suddenly black and turns off. (Can work for several hours or a couple of minutes) Diagnosed the hardware and returned error PPT004. But it is also installed on the computer in parallel with Mac os x, Windows. Which, to my surprise, works stably and does not turn off. So the problem is in the Mac software. Here's what I did: I completely reinstalled the software, reset the SMC, and read the logs (system, diagnostics, etc.) and found nothing suspicious. What should I do?

Macsave Center Answer: Good afternoon, I need to diagnose, maybe the problem is in the video card, although it should also appear on Windows

Topic of the question ~ Exiled ~ 02/21/2016

Hello! I have a 2008 MB134. My old man has been plowing honestly all these years, but he began to freeze often, he works on mains power, the battery died more than a year ago, along with the adapter. I bought a non-original adapter, the Mac started to make a lot of noise, the keyboard backlight disappeared!!! I would like to know from you how much it will cost me to replace the hard drive with an SSD, and the keyboard repair does not work delete button and enter!!! Thank you!!!

Macsave Center Answer: Hello, replacing a button costs 300 rubles, ssd - it all depends on the volume, you can look at the prices in stores, installing 1500 instead of hdd and 2500 instead of cdrom.

Problem with Mac Book~ Roman ~ 02/12/2016

HELLO! MY COMPUTER BOOTS UP AND SHUT OFF IMMEDIATELY. Reasons? What should I do? Thank you

Macsave Center Answer: Hello, there can be a lot of options, most likely the problem is on the motherboard bridge board or power circuits. We can offer free diagnostics.

Macbook pro 15.2011 hangs ~ Oleg ~ 12/27/2015

Hello! When working with a Mac book, problems arise when opening photos and some videos on the Internet, and on the same site something opens and something doesn’t. The laptop freezes and starts to warm up, then there’s just a blue magnetic background and that’s it. I have to forcefully turn it off. reboot everything seems fine

Macsave Center Answer: Good evening, maybe Hard drive, software, cooling system. It needs to be diagnosed, you can come and see everything.

Problems with MacBook Pro~ Nikita ~ 12/21/2015

Good afternoon. Unpleasant and unexpected things happen to my poppy. The Mac is a little over a year old, has never let me down and worked perfectly. For the last three days, the following has been happening to him:

My Mac has more than 20GB of free space, but lately, as soon as I turn on my Mac and the memory melts away in a matter of minutes, it gives me a message that boot disk is full, requires you to close all programs (and closes them yourself) and the memory shows 0kb. That is, the operation of the poppy can take no more than 10 minutes. Afterwards I have to recharge it (which unexpectedly also caused problems and it doesn’t respond every time). After the reboot, there are again about 27 free GB, and every time I check it, I remove a lot more from the Mac to clean it.

In this situation, I turned off the Mac before going to bed, and in the morning I discovered that it had not turned off and the battery charge was zero. The monitor, as far as I remember, went out.

I’m used to the fact that after leaving for about 15 minutes, Poppy goes to sleep. Having got ready for business in the morning and returning in the evening, I discovered that the Mac’s monitor was on as it was a few hours ago. He did not go into sleep mode.

What could all this be connected with?? All this happened starting from December 18 (4th day), before that it worked properly.

Macsave Center Answer: Good afternoon, I need to diagnose, probably a fault in the power circuits

Problem with Eran and lags ~ Denis ~ 12/11/2015

Hello, in general, the problem with mac air 11 is that one day I turned on the computer and stripes appeared on top of the screen, as if distorting the image, and after a few minutes they disappeared.. then the image itself just became as if it had been divided into layers, everything was grainy, and again disappears. At this point the adventures only continued, a lag appeared - the Mac just started to get stupid after some kind of usual operation (for example, closing a program) it thinks, and then just reboots, are these problems related? what to do?

Macsave Center Answer: Good afternoon, I need a ride for diagnostics, the situation is varied and not completely clear. Diagnostics are free.

Macbook pro mid 2014 turns off randomly~ Albert ~ 03-12-2015

Hello. MacBook Pro randomly turns off. Completely random. I carried out diagnostics using the laptop itself, it says that the battery requires servicing. I decided to check that the problem really was there. I unplugged the battery plug and started working purely from a 220 volt network. The laptop started to work slower, but stopped randomly turning off. Does this mean that the problem is really in the battery?

Macsave Center Answer: Good evening, the problem is probably in the battery, the brakes may also be due to a damaged battery, the cost of replacement is 8000-9500 depending on the model

MacBook won't turn on~ Sergey ~ 11/19/2015

Good afternoon. Disease history. The MacBook Pro did not wake up the next morning after going into sleep mode. I started it a couple of times by pressing the “NVRAM reset” keys. Once again, I didn’t engage in these actions at all. The battery is charging. Now fully charged. Can you tell me the algorithm of actions? Thank you

Macsave Center Answer: Good afternoon, you need to diagnose, often similar symptoms are associated with a video card failure, diagnosis is free 1-2 days

Macbook pro mid 2012 md 101 does not turn on ~ Andrey ~ 11/17/2015

Good evening! Tell me about this problem - after the sound signal plays and the apple appears, the poppy turns off, but at the same time it starts checking errors normally (Apple Diagnostics)! SMC - reset, no use, there is a suspicion that the SMC chip has failed! How much will a replacement cost?
PS: The Mac was flooded, but it worked for half a year without problems!
All possible existing teams I tried it on a Mac to no avail!

Macsave Center Answer: Good afternoon, this chip very rarely fails; in your case, I can’t immediately tell what the reason is, it needs to be diagnosed.

MacBook slows down ~ Anna ~ 10/21/2015

Good afternoon The battery on the MacBook Pro (2011) has died; it only works from a wall outlet, but at the same time it is terribly slow. Could these two problems be somehow related? Standard utility The disk diagnostics did not reveal any problems.

Macsave Center Answer: Yes, there is probably a problem with the battery, it needs to be changed, the cost is 5500-6000 rubles depending on the battery model

Topic of the question ~ abu ~ 09/30/2015

macbook air 13, when I turn on the mac it immediately makes noise, freezes a lot, and gets hot. 6500 rpm, which is possible do and repair what is the price?

Macsave Center Answer: Good afternoon, the cost of diagnostics is free, repairs after diagnostics, the problem may be in the chips and the power circuit

Macbook pro turns off ~ Daniil ~ 09/20/2015

Hello. The MacBook Pro 15 (mid 2010) turns off after 5-6 hours of operation from the network. apparently overheating. After I disconnect the adapter and the machine cools down slightly, it works more or less stably. Is it possible to fix/fix this?

Macsave Center Answer: Good afternoon, the cost of cleaning is 2500 rubles, it does not include cooler lubricant and new thermal paste, if this is the problem, then everything will help

Apple equipment repair ~ Evgeniy ~ 09/14/2015

Hello, something burned out on my MacPad and it doesn’t work after an electrical overvoltage. What kind of breakdown is it and how much will the repair cost?

Macsave Center Answer: Good afternoon, the cost and time can only be determined after the diagnosis, it is free and lasts from an hour to 2 days depending on the breakdown situation

macbook air touchpad stopped working ~ ergek ~ 09/12/2015

Hello, in the winter I spilled some water on the keyboard and took the touchpad in for service. They fixed it for me and everything worked fine, but after a while the touchpad began to get dull, but I didn’t pay much attention to it. the other day I accidentally pressed the touchpad (not hard) and it stopped working altogether and the keyboard stopped working. It only works when you press the touch quite hard.

Macsave Center Answer: Good afternoon, we need to carry out diagnostics, the whole fault seems to be in the touchpad and it needs to be changed, the cost of replacement is from. 3000-4500₽ depending on the MacBook model.

Diagnostics~ Maxim ~ 09-09-2015

Good afternoon! How long does it take to diagnose a macbook pro?

Macsave Center Answer: Good day, average term from 10 minutes to 3 days

MacBook Pro won't load ~ Natalya ~ 08/16/2015

Hello, MacBook Pro won't boot. After unsafely removing the flash drive, the MacBook stopped starting. I turn it on loading White screen, apple, the loading bar is at the bottom, it reaches 1/3 and turns off, there is also Windows 7, it also stopped starting, when you load Windows 7 on the MacBook, " blue screen". Help me, how to save information on my computer and what to do?

Macsave Center Answer: Good afternoon, I need to diagnose, probably a software problem

breakdown of macbook A1181~ Yuri ~ 06-08-2015

Macsave Center Answer: Good afternoon, your system seems to have crashed, it needs to be either restored or reinstalled

MacBook ~ Igor ~ 07/09/2015

I have a MacBook, I installed Windows 7 on it, it crashed, I want to restore the Mac, I can’t

Macsave Center Answer: Good afternoon, windows installation 7 comes from your licensed disk and costs 1500 rubles

Resetting the login password to mac oc ~ Sergey ~ 06/15/2015

Good afternoon It does not accept the password when entering the OS - the window shakes and resets the password, I tried to enter the wrong one, but the same thing happens, and it does not even write “incorrect password”. The reset, sleep and exit buttons do not work. I turned it off with the power button - it didn't help. Everything happened unexpectedly - I left it open, he fell asleep and when I began to enter the password, the following story happened. What could it be?

Macsave Center Answer: Good afternoon. Just save everything through external device and reinstall the OS

Doesn't hold charge without being connected to a power outlet (MacBook Air)~ Vitaly ~ 05/25/2015

Good afternoon. MacBook Air stopped charging after taking a bath in tea :). What is the reason? What to do? How much is it?

Macsave Center Answer: Good afternoon, you need to do diagnostics, maybe the problem may be in the power circuits on the motherboard

MacBook Pro retina 15 won't turn on ~ Ivan ~ 05/19/2015

Good afternoon Doesn't turn on MacBook retina 15 2012 Most likely something happened due to overvoltage. The heater was turned on in a nearby outlet when the beech was plugged in. After this, the beech stopped turning on, and where the heater was turned on, it burned out network filter. The charge is intact, I checked it on another Mac. When you insert the charger into the Mac, the light on the charger does not light up, but if you insert it into another working Mac and then into my non-working Mac, it lights up orange! I would have sent it to your center for diagnosis and treatment a long time ago, but I am very far away, and there is no apple service in our city. What would you recommend?

Macsave Center Answer: Good afternoon, you clearly have a problem in the power supply circuits of the motherboard

MacBook Pro 15 (Late 2008)~ Dmitry ~ 05/16/2015

Hello, the insulation near the L-connector was peeling off, I decided to re-solder it - I crushed the LED and broke off a piece of the board when I tried to remove it. The Mac worked from the mains, but stopped charging the battery. I ordered a new cord with an L-connector, while waiting for the cord the battery discharged to 1-2%. I managed to turn off the Mac normally.
I soldered a new cord, plugged it in, the Mac won't start. I installed the battery and it started. But! The indicator on the L-connector DOES NOT LIGHT! (neither green nor orange) I thought it was a Chinese counterfeit, I thought there was no LED at all. The Mac works on mains power, sees the battery BUT does not charge. With the Mac running, I took out the battery, ran it for a while on mains power, then hooked it up and pulled out the plug. The Mac switched off and then stopped starting, either with or without the battery. I read that resetting the SMC can solve the startup problem. But when resetting, the Mac doesn’t react in any way, the indicators are silent, and it still won’t start.
Since the battery was swollen, and there was also a complete discharge, I ordered a new A1281. PRAM/NVRAM reset after forced launch* (without battery). No changes either.
*(Disable MagSafe, hold Power for 5 seconds. Without releasing, connect MagSafe, hold Power for another 5 seconds, release, wait a couple of seconds, launch the Mac). The Mac started up forcibly, but with all the problems that arise, it is necessary to reset the SMC (Indicators-Fans-Lighting-Power).
A new battery arrived: the Mac started up forcibly*, but it says: No battery Power source: battery. (B-rr-rrrr)
I took the Mac (without battery), the charger and went to the neighboring city, found an Apple point. The seller had an Air with 60w, connected its Magsafe to mine - the indicator lit up green, but after 10 seconds it dimmed and soon went out completely (what the hell - I think that’s it! I burned the guy’s MagSafe), plugged it back into my Air - it works. My Mac wouldn't start due to lack of power. We took my 85w with a soldered new cord - L-conn. We inserted it into the Air and it lit up green!!! Hooray! The cord is still working. I put it back into mine and there is no reaction.
Results: replaced the cord with the L-connector, bought a new battery.
The Mac only starts forcibly, SMC is not reset. The LED on the plug does not light up. On the battery charge indicator, the 6th indicator is constantly shining, whether from the network or from the battery. I checked that power is supplied to the MagSafe board and from it to the Mother board in full. All contacts are called. Maybe there is some diagnostics that can be done at home besides (D-at startup), everything is clean there.

Macsave Center Answer: Good afternoon, everything clearly points to the motherboard power circuit. Only diagnostics at the service center will help

Poppy slows down ~ Alexander ~ 04/30/2015

Hello, my MacBook Pro 13 mid 12 suddenly started to slow down. Everything worked fine, I closed the lid, opened it about ten minutes later and that’s it: the response was 5-10 seconds to the action. I thought that the hard drive might have failed (I moved it to the same Mac - everything is fine there). I tried reinstalling the system and it still slows down.

Macsave Center Answer: Good afternoon, we need to do some diagnostics, the problem is unclear

MacBook Pro A-1278 Freezes~ Rustam ~ 04/03/2015

Good afternoon
The MacBook freezes very badly, it’s simply impossible to work, Safe Mode It works as it should, I reinstalled the OS, cleaned the radiator and there was no dust, I changed the hard drive, I also changed the frame, but nothing helps. Is it possible to get out of the standing graph of the card?

Macsave Center Answer: Good afternoon, we need to diagnose, problems can be in the north bridge and many other places

The sound and headphone output do not work ~ Ilya ~ 02/26/2015

suddenly the sound and the headphone output stopped working, the sound sometimes disappeared and was distorted, but then everything suddenly stopped working, this was due to the system or technical problems, the MacBook did not drop...

Macsave Center Answer: Good afternoon, I need to diagnose, perhaps the problem is in the connector, but perhaps in the codec

MacBook Pro A1278 does not turn on ~ Dmitry ~ 11/29/2014

Hello, please tell me what could be the problem:
The Mac stopped starting, namely, when you press the on button, the fan starts and after a while emits one signal with a constant intensity every 3 seconds.
I changed the RAM, removed the hard drive, the CPU heats up within normal limits, I checked without a heatsink, the video card is the same.
I don’t understand what the signal means.

Macsave Center Answer: Good afternoon, I need to diagnose, the north bridge often flies on your models.

Computer macbook began to work very slowly ~ Maria ~ 09/29/2014

The computer began to work very slowly.
I regularly check my rights and disk. Please tell me what this could be? I really hope that the problem is not with the hardware.
Disk Utility says
Error: This disk must be recovered from using Recovery HD. Restart your computer by holding down the Command and R buttons until Apple icon. When the OS X Utilities window appears, select Disk Utility. The Macintosh HD volume has become corrupted and needs to be repaired.

Thank you very much!

Macsave Center Answer: Good afternoon, you need to save your data and reinstall the operating system of your MacBook. The hard drive may well be failing.

MacBook won't turn on ~ Maria ~ 09/20/2014

The Macbook Pro does not turn on, but the fan is working (noisy), the power supply is new, and so is the battery. What is the reason?

Macsave Center Answer: Good evening, there can be many reasons for the lack of signal on the MacBook display, you need to do diagnostics, diagnostics in our center are free.

What to do with a MacBook if it refuses~ Evgeniy ~ 09/20/2014

Hello! macbook a1181 OS x 10.4.11 Skype stopped working, does not connect to the server, trying to install new version the program was not successful. On the Skype website it says that our operating system is no longer supported by Skype. What do you recommend...

Macsave Center Answer: Good evening, you need to update OSX, your Mac supports newer systems.

Spontaneous shutdown of the MacBook Pro Retina 2013 ~ Lucy ~ 09/01/2014

Hello. My MacBook Pro 13 Retina turns off as soon as I take my finger off the touch track. A sign appears asking you to turn it off. sleep mode, cancel and reboot. I click on cancel, put my finger on the touch track and then everything works. power button it doesn't work to turn on, you have to close the lid and open it again - the poppy turns on by itself. I haven’t dropped it, haven’t spilled it, I use it carefully, the poppy is only 2 months old. What could it be..

Macsave Center Answer: Good afternoon, the problem may be either in the operating system or in the hardware. The retina touchpad is problematic. Come on over, we’ll do some diagnostics, and we’ll check it in front of you.

Macbook pro a1286 won't turn on ~ Grigore ~ ​​07/19/2014

Good afternoon, I have a MacBook ma348ll/a or 1175 15", the problem is that it does not start with RAM, and when I remove the RAM, the screen starts up but the screen does not turn on. Could it be the video card?

Macsave Center Answer: Good afternoon, in your case it may well be that the video chip has failed, this is a very common breakdown of MacBooks A1286. But first we do diagnostics, because anything could break.

Good day! Please tell me, is it possible to “permanently” solve the problem of high CPU (250-300) and OP (above 1gb) load by the kernel_task process, or is it time for service?! I could not determine the cause of the appearance. Reinstalling OS X on a formatted HD did not bring the desired result; I temporarily solved the problem by deleting Plist with ID MacBookPro8_1, but after installing the next update there was again a strong delay in system responses. Parameters: 2.3 GHz Intel Core i5, 8 GB 1600 MHz DDR3, Graphics Intel HD 3000 512 mb, Serial number C17F9GXMDH2G, OS X 10.9.3 (13D65). Thank you in advance for your response!

Macsave Center Answer: Good afternoon, the situation is strange, you need to diagnose the hardware, there are a number of reasons why such a problem may occur on a MacBook.

What about him? ~ Evgeny Voevodin ~ 04/07/2014

Hello!
I have a macbook air 13 inches, mid 2012. OSX 10/9/2 The problem is the following: it works great, does not heat up, does not glitch, incl. under load, only if it boots. And it loads within a couple of hours - easily, maybe longer. First, the white screen lasts 20-40 minutes, then the user’s choice, the same amount, slows down unrealistically, asterisks when entering a password are displayed with a delay of at least 5 seconds. But after that, when exiting sleep mode, there are no problems.
The problem is that I’m in Sevastopol, local technicians can’t advise anything except how to replace the motherboard, and they can’t do that either... I’m sitting here thinking about buying a new one, or is it some kind of typical problems for a specific problem with a specific final cost. Thank you!

Macsave Center Answer: Good afternoon, problems often occur in Hard drives SSD and cables on the MacBook motherboard, the south bridge could also fail. A full diagnosis is required.

Operating room installation macbook systems a1181 ~ Stanislav ~ 03/17/2014

Good afternoon, I have the following problem, I will try to describe it step by step.
I have a macbook 1181, it was inherited, so to speak, the previous owner did not spare it much.
At some point the operating system stopped loading. After starting the laptop, an apple icon appeared and a rotating circle underneath it, then nothing happened, I tried leaving it overnight, and the same thing in the morning.
According to previous owner This has already happened to him, the operating system also crashed, this was solved by reinstalling it. Latest OS 10.7.4

When I try to reinstall the OS on the same 10.7.4, the system freezes while preparing for installation. I waited for several hours, no result.
I replaced the hard drive in the laptop, formatted it according to the instructions, tried to install OS 10.6.3, the same situation, it recorded in the last minutes of loading. At some point it just loaded, after which the screen went blank. I forcibly rebooted it and left it to boot from the hard drive, it spun (about 30 minutes) and played a melody, but the screen remained gray.
The last time I tried to reinstall the OS, the process froze about 30 minutes before completion (the screen worked, but did not respond to the touchpad).
I also tried changing bootable USB flash drive, The result is the same.

Please tell me what could be the matter?

Macsave Center Answer: Good afternoon, problems with the hard drive often manifest themselves this way. It’s time to change the hard drive in your laptop because in the Mac A1181, during this time, more than one hard drive has changed, as an option the north bridge may be, but this is rare.

MacBook Pro display goes out~ Evgeniy ~ 01/11/2014

Hello,
after a large glass of dry white wine, the laptop came back to life after a couple of days, however, when I launch Final Cut, Photoshop, VLC, the display goes blank.
Adobe Illustrator works with vectors; working with shadows also disables the display.
When examining the motherboard, no traces of flooding, much less corrosion, were found.
2.4 GHz Intel Core i7 processor, Intel HD 3000 graphics 384 MB, OS X 10.8.5
What could it be?

Macsave Center Answer: Good afternoon, often such problems are associated with video memory and video card, but in your case you need to do detailed and lengthy diagnostics since it most likely flooded under the chips.

Small MacBook 11 screen does not work ~ Yana ~ 09-10-2013

Hello, I have an Apple Air 11 screen on the bottom that says MD508. Help me fix my baby, I turn it on with a button, but it doesn’t give any life signals, everything is silent and the screen doesn’t light up, as I understand it, I need to do diagnostics?

Macsave Center Answer: Good afternoon, there may be a problem with the MacBook’s power connector or a power problem on the motherboard, we’ll do diagnostics within a day and tell you what the problem is on your Aira.

Fair, not overpriced and not underestimated. There should be prices on the Service website. Necessarily! without asterisks, clear and detailed, where technically possible - as accurate and concise as possible.

If spare parts are available, up to 85% of complex repairs can be completed in 1-2 days. Modular repairs require much less time. The website shows the approximate duration of any repair.

Warranty and responsibility

A guarantee must be given for any repairs. Everything is described on the website and in the documents. The guarantee is self-confidence and respect for you. A 3-6 month warranty is good and sufficient. It is needed to check quality and hidden defects that cannot be detected immediately. You see honest and realistic terms (not 3 years), you can be sure that they will help you.

Half the success in Apple repair is the quality and reliability of spare parts, so a good service works with suppliers directly, there are always several reliable channels and your own warehouse with proven spare parts for current models, so you don’t have to waste extra time.

Free diagnostics

This is very important and has already become a rule good manners for the service center. Diagnosis is the most difficult and an important part repair, but you do not have to pay a penny for it, even if you do not repair the device as a result of it.

Service repairs and delivery

A good service values ​​your time, so it offers free shipping. And for the same reason, repairs are carried out only in the workshop of a service center: they can be done correctly and according to technology only in a prepared place.

Convenient schedule

If the Service works for you, and not for itself, then it is always open! absolutely. The schedule should be convenient to fit in before and after work. Good service works on weekends and holidays. We are waiting for you and working on your devices every day: 9:00 - 21:00

The reputation of professionals consists of several points

Company age and experience

Reliable and experienced service has been known for a long time.
If a company has been on the market for many years and has managed to establish itself as an expert, people turn to it, write about it, and recommend it. We know what we are talking about, since 98% of incoming devices in the service center are restored.
Other service centers trust us and refer complex cases to us.

How many masters in areas

If there are always several engineers waiting for you for each type of equipment, you can be sure:
1. there will be no queue (or it will be minimal) - your device will be taken care of right away.
2. you give your Macbook for repair to an expert in the field of Mac repairs. He knows all the secrets of these devices

Technical literacy

If you ask a question, a specialist should answer it as accurately as possible.
So that you can imagine what exactly you need.
They will try to solve the problem. In most cases, from the description you can understand what happened and how to fix the problem.

Today we’ll talk about collecting diagnostics in macOS

Information about the computer and programs

If you select “About This Mac” from the Apple menu and then click on the “System Report” button, you will see a bunch of information about your computer. So, the system_profiler utility is the same thing, but a hundred times more detailed.

If you call system_profiler without parameters, the entire information will be displayed, which in my case means 3.8 MB of text. So I recommend immediately writing something like system_profiler > ~/Desktop/profile.txt or using grep to find the required line.

Among what system_profiler spits out, you will find information not only about the system and devices, but also about all programs, drivers, plugins, libraries and fonts. At the same time, parts of the system logs and a bunch of other crap will be displayed.

If all this does not interest you, write system_profiler -detailLevel mini, and then you will only get information about the computer.

You can also add parameter -xml, to make it more convenient to process the received information in the script.

Directory service

The dscl utility is responsible for communicating with the directory service - Directory Services Command Line, it at one time replaced netinfo. Got a whiff of sysadmin stuff? This is true, and we will not dwell on them in detail.

For starters, a couple of commands: dscl . -list /Users will list all users, and dscl . -read /Users/<имя пользователя>- information about the user in XML form. Even a file with an avatar is encoded inside!

By the way, if you run dscl without parameters, it will enter interactive mode, where you can use the usual cd and ls commands for navigation, and view the contents of branches using the read command.

Directory Services caches and user list

Dscl comes with another utility, dscacheutil, which is responsible for working with directory service caches. You probably know it much better than dscl, since for a long time it was what you needed to run to reset the DNS cache.

By the way, in latest versions This does not work on macOS, and instead of dscacheutil -flushcache you now need to write killall -HUP mDNSResponder.

As for dscacheutil, it is convenient to use it to display a list of users: dscacheutil -q user. Unlike what dscl outputs, the result is much easier to perceive.

Reading and (not) resetting values ​​in NVRAM

Every Mac has non-volatile memory that stores variables important to the computer's operation. What exactly is there? The nvram command will help you find out: write nvram -xp, and you will see everything.

There are both harmless things like sound level and the latest keyboard layout, as well as more interesting ones like the Find My Mac key and completely mysterious EFI parameters.

All of them are presented in binary form, and the only fragment of a description that I could find is contained in a CIA document leaked and posted on WikiLeaks.

Parameters can be set with the nvram command<переменная>=<значение>, delete with nvram -d command<переменная>or load from file using nvram -f<файл>.

You can reset everything by typing nvram -c. But usually NVRAM parameters are reset only if something went wrong and the computer does not boot. To do this, press Alt-Cmd-P-R immediately after turning it on and hold it for 20 seconds.

Please note: if you change parameters using the nvram utility, they will not be written to non-volatile memory instantly, but only when the computer is turned off in normal mode.

RAM statistics

There are many ways to see how much RAM is used. Perhaps the simplest is to open the “Memory” section in “System Monitoring”: the most useful parameters are presented there in a visual form. From command line It's best to use top.

If you need the most detailed information, then you can refer to vm_stat. The disadvantage of this utility is that all values ​​are given in pages equal to 4 KB. However, it is not so difficult to recalculate, and there are a lot of scripts on the Internet - for example, this one-liner in Perl converts everything into megabytes.

You can also use vm_stat to track changes in memory load over time. To do this, enter vm_stat -c<число> <секунды>, where the first parameter is the number of measurements, and the second is the interval between them.

Resetting disk cache in memory

The purge command helps you temporarily get a couple of extra gigabytes of RAM. It is called from root, has no parameters and clears the disk cache, bringing it to the state it was in after loading the OS. But usually the memory manager does not need such help - it will gradually unload the excess if the RAM runs out.

The certificate says that purge is generally needed mainly for testing, but who knows how life will turn out?

File system access tracking

The fs_usage command, launched without parameters from root, displays a record of each access to file system. This is needed in cases where a program crashes on startup or produces mysterious error messages. If the problem is that one of the files is damaged, then you can find it with fs_usage.

To reduce the need to rummage through the results, limit the messages to one process by writing its name after fs_usage. If you only know the ID, type sudo fs_usage pid .

Another useful parameter is -f, after which you can set a filter for operations with the network (-f network), with files (-f pathname will add a column with the path) and so on. If the text does not fit on the line, add -w.

The easiest way to avoid the help of service centers when searching for hardware problems (not all of them can boast of a good reputation) is to use the built-in Mac diagnostic methods. In this material we will tell you how to run and use the “Apple Hardware Functional Test” and “Apple Diagnostics”.

With help regular funds diagnostics can effectively detect hardware faults (hard drive problems, solid state drive, RAM, GPU, motherboard and other nooks and crannies of hardware). How to do this?

On which Macs which utility?

Regardless Mac models(MacBook, iMac, Mac mini or Mac Pro) and its year of manufacture, the operating system includes a utility for self-diagnosis of the hardware. On computers manufactured before June 2013, it is called the Apple Hardware Test (AHT), and after that it is called Apple Diagnostics.

Before running any of the utilities, be sure to disconnect all peripheral devices (including optical drives, if such antiquity still exists) except for the keyboard, mouse, display and Ethernet adapter. Some versions of OS X Lion and later may require Ethernet or Wi-Fi to run the Internet version of AHT. It is no different from its offline counterpart.

To use AHT, be sure to connect your MacBook to a power source.

List of keyboard shortcuts

If you don’t have a mouse, the following shortcuts will come in handy:

• Option (⌥) + D: run diagnostics with the Internet;
• Command (⌘) + G: start operation;
• Command (⌘) + L: display a list of languages;
• Command (⌘) + R: run the test again;

How do I use Apple Hardware Test or Apple Diagnostics?

Note: Apple Hardware Functional Test and Apple Diagnostics work identically. The only caveat is that Apple Diagnostics requires an active Internet connection to run, and the interface will be much prettier.

1. Turn on or restart your Mac if it is turned on.

2. While powering on, press and hold the "D" key until the gray boot screen appears, then wait a few minutes for the AHT configuration to complete. During loading the following icon will be displayed:

3. Now select the language and press the button to the right (if a mouse is not connected to the computer, then select the language using the arrows and enter with the “Enter” key).

4. After the ANT console boots up, select one of the tests you want to run.

Main test— press the “Test” button, or the T or “Enter” key.

Full test— under the “Test” button, check the “Run advanced test” checkbox.

After the check is completed, the results will be displayed in a window located in the lower right corner of the console.

To exit the ANT utility, click the “Restart” or “Turn Off” button at the bottom of the window.

What do the results say?

If problems with the hardware are detected during the test, then get ready to see an error and some explanatory details.

You can decipher AHT errors on the Apple technical forum, and in general I recommend that you go there first when looking for solutions to problems with Apple gadgets. True, you will need knowledge of English, at least with a dictionary.

Codes Apple errors Diagnostics and their decoding can be viewed.

In any case, if it was not possible to avoid repairs at the service center, we strongly recommend that you contact only certified specialists who specialize exclusively in Apple equipment. It won’t be cheap, but purchasing a new gadget is much more expensive. It’s better to completely forget about the basement workshops “at Uncle Vasya’s”. Repairing Apple devices requires a very meticulous approach and advanced skills.

Based on materials from yablyk