Not a single USB port works. Connecting USB ports on personal computers

Useful tips

USB technology is one of the most important of the huge number of technologies that have had a great impact in the computer world. USB (stands for Universal Serial Bus) is a serial interface designed for data transfer for medium and low-speed computer peripheral devices.

This technology has made it possible to work with scanners, printers, and also external devices (USB flash drives, hard disks external) truly light and comfortable. All actions related to USB installation devices come down to the “Plug and Play” principle. These devices have become truly mobile thanks to USB technology. Today, laptops, desktop PCs, as well as various gaming devices, cameras, smartphones, navigators, TVs and other devices.

USB 2.0 ports data transfer occurs at speeds up to 480 Mbps, in the USB 3.0 version maximum speed transmission rises to 5 Gbit/s. The USB symbol is a kind of trident that is drawn on both USB devices and computer connectors.

This technology has already been sufficiently studied and has undergone many improvements, and therefore USB ports rarely cause any problems when used correctly, and troubleshooting them causes little hassle. In this article we will look at the basic principles for troubleshooting any problems that may arise with USB ports.

if the USB ports on the motherboard have mechanical damage, then they should be disconnected from motherboard(connectors on the front of the case) or seal them with tape so that they are not used. Such ports should be replaced with new ones in a workshop at the first opportunity.
do not connect devices if there are visible mechanical damages USB connectors, and the device, if there is external damage to the case, or there is a burning smell.
Do not overload USB ports. The current in them is limited: for USB 2.0 - 500 mA, for 3.0 - 900 mA. Do not increase the number of USB ports using different USB multipliers. New motherboards have up to 10 ports, which is quite enough. It is safer to purchase additional PCIe or PCI controller USB, rather than working through a USB “tee”.
Before connecting USB, in order to remove static voltage, it is recommended to touch the grounded body of the system unit. Static discharges are often main reason refusal USB operation devices.

If the USB ports stop working on a laptop, then it becomes very difficult to work on it - you cannot connect a scanner, a printer, or a flash drive. Unlike desktop computers, installing an additional USB controller is quite expensive.

When error messages like this “USB device not recognized” appear, in most cases, the problem may be with the USB port. Is being decided this problem quite easily, because it arises on program level.

Any hardware device interacts with the driver through operating system. Most device problems are resolved using drivers. This also applies to non-functional USB ports. Below we will look at several ways to help troubleshoot USB ports at the software level.

Restart your computer

If the ports suddenly stop working, and the computer does not detect the USB device, then the easiest way to fix the sudden problem is to restart the computer. Restart your computer. If there were no problems loading the drivers, then this problem will be eliminated after a reboot.

Update hardware configuration in Device Manager

If in this moment restarting the computer is not advisable (for example, some important operation is being performed), then without restarting the entire computer, you can “reload” the driver using Device Manager. To launch it, you need to press right click mouse on the “My Computer” shortcut and select “Manage”. Or go to the “Start” menu and find the “Run” program there, launch it, and then enter the command devmgmt.msc in the field.

A window will open in front of you, where you need to left-click once on the list of devices, then click the “Action” tab in the main menu and point to the “Update hardware configuration” button. The “USB Controllers” section should appear in the list of devices. If it appears, it means your problem has been solved and the USB ports should work.

Disabling the USB controller

Another way to get the USB ports to work is to unplug and then reinstall the USB controller. To do this, launch Device Manager. We find the USB controllers section in the equipment list. In this section, right-click on each of the devices, then delete them all. Once all controllers have been removed, restart your computer. The controllers will be reinstalled and the USB ports will become available again.

Updating USB controller drivers

The cause of USB ports not working may be damage to the USB controller drivers. The solution is to find the correct drivers and reinstall them. To download the appropriate drivers, you need to find out the manufacturer specific port USB devices. By installing the correct driver, the problem should be resolved immediately.

Disabling other USB devices

It happens that USB ports do not work because they are overloaded when there are too many USB devices connected. USB hubs sometimes do not provide sufficient power to the devices connected to it. Some connected device can use the full power of the USB controllers. If the equipment is connected to a USB hub, then reconnect the device to the USB port directly.

You can leave your device connected to the USB hub, but you must first turn off other devices in the hub. Buy a USB hub that has its own power supply, which will provide sufficient power to all devices connected to it.

If none of the above methods helped you, then most likely the USB ports are physically damaged. Or the USB controller is damaged, south bridge on the motherboard in particular. IN in this case, it is best to have the USB port controller repaired or replaced at a service center.

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USB technology is one of the most important of the many technologies that have had a huge impact in computer world. USB (Universal Serial Bus- “universal serial bus”) - serial interface data transfer for low- and medium-speed computer peripherals

This technology has made it truly easy and convenient work with printers, scanners and external storage devices ( external hard disks, USB flash drives). All actions with installing USB devices came down to a simple principle: “ Plug and play" Devices have become truly mobile precisely because of USB technology. Today, not only desktop PCs and laptops are equipped with USB ports, but also gaming devices, smartphones, cameras, navigators and many other devices.

Ports USB version 2.0 provide data transfer at speeds up to 480 Mbit/s, and the version USB 3.0 raises the maximum transfer speed to 5.0 Gbps. The USB symbol is a kind of trident, drawn both on USB devices and on computer connectors.

Technology USB already has been studied quite seriously and has undergone many improvements, so USB ports, when used correctly, rarely cause any problems, and troubleshooting problems associated with them does not cause much trouble. This article will outline the basic principles of troubleshooting USB ports.

But before we begin, it’s worth describing basic recommendations when working with USB ports and devices, connected to them:

- never connect devices with visible mechanical damage to USB connectors, as well as devices with external damage to the case or with a clear burning smell.

If the USB ports on the motherboard are mechanically damaged, it is better to disconnect them from the motherboard (the connectors on the front of the case) or seal them with colored tape to prevent their use. If necessary, it is better to replace such ports in a workshop with new ones.

Try not to overload USB ports. Their current strength is strictly limited: 500 mA for USB 2.0 and 900 mA for version 3.0. Do not strive to increase the number of USB ports using various USB multipliers. Modern motherboards already have up to 10 ports, which is quite enough for home use. It is always safer to buy an additional PCI or PCIe USB controller than to work through a USB “tee”.

If the USB ports on a laptop stop working, then working on it becomes very difficult - you cannot connect a printer, a scanner, or a flash drive. And unlike desktop computer, installation additional USB The controller is a very expensive pleasure.

In many cases, when the error message " USB device not recognized "The problem may be in the USB port. This problem is usually solved quite easily, since it occurs mainly at the software level.

What to do if the USB ports do not work?

Any hardware device interacts with the installed operating system through special program - driver. Many problems with devices are solved with the help of drivers. The same is the case with non-functional USB ports. Below are several methods that will help you troubleshoot USB ports at the software level.

If the USB ports suddenly stop working, and USB devices are not detected, then the most in a simple way The solution to this sudden problem will be to restart your computer. Just restart your computer. If there were no problems loading the drivers, this problem will be resolved after a reboot.

Update hardware configuration in Device Manager

If restarting the computer is not desirable at the moment (for example, because some important operation is being performed), then you can “reload” the drivers without rebooting the entire computer via device Manager. To launch it on the shortcut " My computer» right-click and select the menu item « Management e". Or in the menu " Start» find the program « Execute"and after launching it, enter the command devmgmt.msc.

In the window that opens, left-click once on the list of devices and then click the tab " in the main menu Action", then point to " Update hardware configuration" See if the section " USB controllers" If yes, then your problem is solved, the USB ports should work.

Another way to get USB ports to work is to unplug and then reinstall the USB controller. To do this you need to run again device Manager. In the list of equipment that you will see in the window that opens, find the USB controllers section. On each of the devices in this section, right-click and delete them all. Once you remove all controllers, simply restart your computer. The controllers will be reinstalled and the USB ports will become available again. This may solve your problem.

Update USB drivers-controllers

Another reason that USB ports do not work is damage to the USB controller drivers. The only way out is to find the correct drivers and reinstall them. To download the appropriate driver, you need to find out the manufacturer of the USB device port (via it). Installation correct driver should solve this problem in an instant.

Disabling other USB devices

Sometimes USB ports do not work due to overload when too many USB devices are connected. USB hubs sometimes do not provide enough power to the devices connected to it. The connected device can consume all the permitted power of the computer's USB controllers. If the equipment is connected to a USB hub, then simply connect the device directly to a USB port on your computer.

You can also leave the device connected to the USB hub, but first disconnect other devices in the hub. For the future, purchase a USB hub with its own power supply that will provide sufficient power to all devices connected to it.

If none of the above methods worked, then it is likely that the USB ports were physically damaged. Or the USB controller, in particular the south bridge of the motherboard, is damaged. In this case, the best thing you can do is replace or repair the USB port controller at a service center.

Peripheral devices such as a mouse, keyboard, Web camera, and printer are usually connected to the computer via USB ports. In this case, it often happens that one or more ports stop working. That is, when you connect, for example, a flash drive to a computer, it is not recognized, the keyboard or mouse may freeze, and the printer may not respond or print pages.

There are several probable causes where some or all of the USB ports on the computer do not work. Let's try to understand this issue and find out what should be done to restore normal functioning computer.

Checking BIOS settings

The first thing you should pay attention to is BIOS settings computer. To enter the BIOS you will need a working keyboard. If the keyboard is connected to the computer via USB and it does not work, then you need to connect a keyboard with a PS/2 connector. Otherwise, you simply won't be able to do anything.

So, let's go to the BIOS, for which, when starting the computer, you need to press the enter key, usually DEL. There may be another key that appears on the screen and is listed in the motherboard manual. After entering the BIOS, find the section responsible for integrated devices (Integrated Peripherals) or the “Advanced” section. Here you should find the “Onboard Devices Configuration” subsection. It contains the parameters responsible for the operation of USB controllers: USB Function or USB 2.0 Controller. These parameters must be Enabled. And if one of them is disabled, then hover over it and press Enter, thereby turning it on. To ensure that the changes you make are not lost, you must save them by pressing F10 and confirm saving by pressing the Y or Enter key.

After restarting the computer, check if the USB ports are working. And if not, then you should look for the reason elsewhere.

USB ports on the front of the computer do not work

How special case USB only on the front panel may not work for you. In such a situation, you need to check whether the necessary connectors on the motherboard are connected and whether the wires are damaged. To do this, open the side cover of the system unit and pay attention to the connector at the bottom of the motherboard. On the board itself there is an inscription USB1 or USB2, as well as on the block itself. The wires from the block go to the front panel, and if they are disconnected or broken in one place, then you have discovered the cause of the malfunction. Damaged wires should be connected or replaced. It would also be a good idea to check the contact in the connector on the motherboard. It is also worth paying attention to the board located on the front panel. Perhaps there is short circuit By the way, such a short circuit can be caused by accumulated dust. Therefore, be sure to clean the system unit from dust.

Problems with the device itself or the cable

The next source of problems with USB may be the cable with which, for example, the printer is connected. This fault is easy to identify and fix. We connect the flash drive to the connector being tested. If it works, then we try to connect another known-good equipment, for example a USB hub, using a suspicious cable. If it also refuses to work, then the reason is clearly in the cable and it should be replaced.

Power outages

There are situations when there is simply not enough power for all devices. For example, when connecting external hard A disk that uses two USB connectors at once may turn off the printer or keyboard. In this case, the power of the power supply is not enough to provide energy to all consumers. In this case, the problem may not appear immediately, but after some time after turning on the computer. There are several ways out of the situation. If you have a low-power power supply installed, for example, 300 W, then it would be logical to change it to a more powerful one, 450-600 W. You can also use an active USB hub (with external power). It will allow you not only to increase the number of connected USB devices, but also to power them from a separate power supply.

Another reason that affects USB operation is a dead CMOS battery. But at the same time, every time you turn on the computer, you will observe a problem system time and date. After replacing the battery the problem goes away. But this doesn't happen often, so you should check the rest possible sources malfunctions.

Missing or incorrect installation of USB drivers

Reasons related to software malfunctions in Windows 7/10, can be identified using Device Manager. If you notice that one or more devices in particular are not working, regardless of the port used, this may indicate that the problem is in the device itself. Open Control Panel and go to Device Manager. All connected devices will be displayed there. If there are items in the list next to which there is a yellow Exclamation point or instead of the name it stands Unknown device, then the problem is in this very device. There may be several possible problems here.

Often USB inputs stop working after Windows reinstallation 7/10. The reason is incorrect installation drivers or necessary drivers may not be found at all. You will have to select and install manually.

Often, to fix a problem you just need to update the drivers. Yes, if disabled automatic update Windows, and the system itself was installed quite a long time ago, its relevance is lost software, may appear system errors. In this case, the device begins to work incorrectly, or even stops functioning altogether. To update (reinstall) USB controller drivers, you can use a CD/DVD with drivers for the motherboard or download the necessary drivers from the motherboard manufacturer's website.

You can also turn off the power saving feature for all ports using Device Manager. Expand the list of used USB devices hidden in the sections “USB Controllers”, “Mouse and other pointing devices”, “Keyboards”. Double-click on to the desired device to open the properties window. Now switch to the “Power Management” tab and uncheck the “Allow the computer to turn off this device to save power” checkbox. Thus, the device will always be activated under any circumstances.

If some equipment is not recognized, then there may be either a problem with the drivers already known to us, or a hardware problem, consisting of a lack of contact, a damaged cable, or a malfunction of the controller. Moreover, it often happens that when a faulty device is connected, the others stop working normally. The keyboard starts to freeze, as does the mouse, and the printer stops printing. The problem is similar to power shortage, that is, all power consumption is spent on faulty device, in which there may be an ordinary short circuit or other malfunction.

USB ports not working due to controller damage

If none of the above actions helped restore the functionality of the USB ports, then you should check the USB controller of the motherboard, which may have failed. High-quality repair and diagnostics in this case should be entrusted to specialists service center. As a way out of the problem, try installing an expansion card, the so-called USB PC controller, which is installed in the PCI slot on the motherboard. This solution is noticeably cheaper than repairing the motherboard USB controller, and when using an additional USB hub, the problem with the lack of ports will not be relevant at all.

As you can see, finding and fixing problems with USB ports is quite a troublesome task, and all because there can be a lot of reasons. Consistent search and elimination of obviously incorrect paths will allow you to identify and eliminate the problem.

The presence of USB ports on devices has become firmly established in the life of the modern consumer. Therefore, when the USB ports on a laptop or PC do not work, obstacles may arise for comfortable work. A non-functional port can prevent the printer, scanner, or other external drives information.

Rules for using ports

First of all, to prevent connector damage, it is recommended to follow several simple rules:

Avoid connecting devices with noticeable damage to the port or housing, burning odors, or other signs of operational failure to the USB connector;
do not overload the ports by resorting to all kinds of multipliers and tees;
touch the computer case before working with USB. This will remove static electricity, which is the most common root cause of breakdown.

When purchasing equipment, the warranty often does not cover USB ports. This is due to the high probability of their breakdown by inexperienced and careless users who do not believe that working with a laptop and especially ports needs to follow any rules.

Factors leading to malfunctions and ways to solve them

To quickly and most effectively eradicate the problem when USB ports on a computer or laptop do not work, it is enough to understand exactly why the port does not work. The main causes of failures and breakdowns are:

Hardware obstacle

This could be dust, damage to the external cable or the controller itself, an unconnected block, lack of power, and others.

The above problems can be solved using:

replacing broken components in a laptop or computer;
checks to see if all parts are connected and working correctly system unit and laptop;
systematically maintaining the cleanliness of the laptop and other activities related to technical side question;

Obstacle in the software

Since the device communicates with the operating system using drivers, many problems can be caused by their inoperability. In this case, some simple methods can help:

disabling the controller through device manager. Another method related to the manager could be to disable the controllers by removing them and then rebooting the device. The controllers will be reinstalled and the ports will work;
driver update. If there is a defect in the drivers, you can find new ones and reinstall them. Installing the correct driver will solve the problem and everything will start working. A problem often arises when, after updating drivers for other components, USB ports do not work. Then you need to determine: the problem is with the drivers for the device using the connector, or directly in the effectiveness of the port itself. In the first case, installing an updated driver will help, in the second you will need to look for where exactly the breakdown occurred: the south bridge, the motherboard or something else and solve exactly this problem;
disconnecting other USB devices. Ports become disconnected due to overload and lack of power. In this case, stopping other devices operating via USB will help.

There is also a reason why the USB port specifically on the motherboard of a laptop or computer does not work. It is quite possible that there is a short circuit on it. This can be avoided by systematically cleaning it from dust, checking that it is firmly secured and not loose, and removing static electricity before work. If the ports on the motherboard stop working gradually one at a time, then you need to prepare to change the board itself. Since, perhaps in the next six months, it will stop working.

A temporary work solution can be a PCI USB controller. However, if the south bridge burned out, this will not help. With this option, the only option is to go to a mechanic to replace the bridge. It is impossible to fix such a malfunction on your own, due to the fact that replacing a bridge is a complex and time-consuming job that requires specialized tools and skill.

Control programs

An assistant in diagnosing USB operation for the user can be special programs designed to identify all connected devices and their status. It is in the program that you can see which device “conflicts” with the equipment, which will significantly reduce the amount of time spent searching on your own. You can find these programs yourself on the Internet; they are freely available, free, and their selection is quite large. Here are some of them (the download link is in parentheses):

USB Manager

USBDeview

Advanced USB Monitor

USB Watchdog
There are also programs that can block all USB ports. One of them is USB Watchdog.

Most often, users resort to them if they store important information, to which access should be restricted. Additionally, such blocking will allow you to avoid malicious software that may be located on the drive inserted into your computer or laptop.

In large enterprises and offices, information leakage from laptops can be prevented using a program that, when using the port, will execute the script programmed system administrator. IN this option the program works as a “watchman”.

Repair

If the USB ports on your computer or laptop still stop working and nothing helps solve the problem, then the connectors need to be replaced. You can do this yourself at home, or by contacting a specialized service, where specialists will work on it.

For self-replacement port you will need a soldering iron, rosin and a new connector. Naturally, it is necessary to be able to work with a soldering iron, as well as knowledge about the structure of the computer, because it will need to not only be disassembled, but also assembled back into correct sequence. It is important to understand that in this case there is a chance of doing something wrong and everything will stop working. In the future, the services of a specialist will be required, and the cost of repair work will increase significantly.

Of course, repairing a laptop in a workshop will cost a little more than home option. But replacement services have various ports available, which can be selected taking into account the size of each specific computer or laptop. Also, the advantage of contacting a workshop will be a guarantee for the work performed, which will allow you to contact us again if the repair turns out to be of poor quality. In this case, the main thing is to take a responsible approach to choosing a workshop so that the money is not wasted.

In general, faulty connectors on laptops and computers are easy to fix. You can do this either on your own or with the help of a professional. Timely prevention of malfunctions will extend the service life of computer or laptop components and avoid extra costs for repairs.

Have a great day!

USB technology is one of the most important of the many technologies that have made a huge impact in the computer world. USB (Universal Serial Bus- “universal serial bus”) - a serial data transfer interface for low- and medium-speed computer peripheral devices

This technology has made it truly easy and convenient to work with printers, scanners and external storage devices (external hard drives, USB flash drives). All actions with installing USB devices came down to a simple principle: “ Plug and play" Devices have become truly mobile precisely because of USB technology. Today, not only desktop PCs and laptops are equipped with USB ports, but also gaming devices, smartphones, cameras, navigators and many other devices.

USB technology has already been studied quite seriously and has undergone many improvements, so USB ports, when used correctly, rarely cause any problems, and troubleshooting problems associated with them does not cause much trouble. This article will outline the basic principles of troubleshooting USB ports.

But before we begin, it’s worth describing basic recommendations when working with USB ports and devices, connected to them:

- never connect devices with visible mechanical damage to USB connectors, as well as devices with external damage to the case or with a clear burning smell.

Try not to overload USB ports. Their current strength is strictly limited: 500 mA for USB 2.0 and 900 mA for version 3.0. Do not try to increase the number of USB ports using various USB multipliers. Modern motherboards already have up to 10 ports, which is quite enough for home use. It is always safer to buy an additional PCI or PCIe USB controller than to work through a USB “tee”.

If the USB ports on a laptop stop working, then working on it becomes very difficult - you cannot connect a printer, a scanner, or a flash drive. And unlike a desktop computer, installing an additional USB controller is very expensive.

In many cases, when the error message " USB device not recognized "The problem may be in the USB port. This problem is usually solved quite easily, since it occurs mainly at the software level.

What to do if the USB ports do not work?

Any hardware device interacts with the installed operating system through a special program - driver. Many problems with devices are solved with the help of drivers. The same is the case with non-functional USB ports. Below are several methods that will help you troubleshoot USB ports at the software level.

If the USB ports suddenly stop working and USB devices are not detected, then the easiest way to fix this sudden problem is to restart the computer. Just restart your computer. If there were no problems loading the drivers, this problem will be resolved after a reboot.