USB technology is one of the most important of the many technologies that have had a huge impact on the computing world. USB (Universal Serial Bus- "universal serial bus") - a serial data transfer interface for low-speed and medium-speed computer peripheral devices
This technology has made it really easy and convenient work with printers, scanners and external devices data storage (external hard drives, USB flash drives). All actions with the installation of USB devices were reduced to simple principle « Plug and Play". Truly mobile, devices have become precisely because of USB technology. USB ports today are equipped not only with desktop PCs and laptops, but also with gaming devices, smartphones, cameras, navigators and many other devices.
Ports USB version 2.0 provide data transfer at speeds up to 480 Mbps, and the version USB 3.0 raises top speed transmissions up to 5.0 Gbps. The USB symbol is a kind of trident, drawn both on USB devices and on computer connectors.
USB technology has already been seriously studied and has undergone many improvements, so USB port s when used correctly, they rarely cause any problems, and troubleshooting associated problems is not much of a hassle. This article will outline the basic principles of troubleshooting USB ports.
But before we start, it's worth describing basic recommendations when working with USB ports and devices connected to them:
- never connect devices with visible mechanical damage to the USB connectors, as well as devices with external damage to the case or with a clear smell of burning.
If the USB ports on the motherboard are mechanically damaged, then it is better to disconnect them from motherboard(connectors in the front of the case) or cover with colored tape to prevent their use. If possible, it is better to replace such ports in the 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. Don't try to increase the number of USB ports with different USB multipliers. Modern motherboards already have up to 10 ports, which is 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 USB ports stop working on a laptop, then work on it becomes very difficult - you can’t connect a printer, scanner, or USB flash drive. And unlike a desktop computer, installing an additional USB controller is very expensive.
In many cases, when you receive 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 program 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 true for non-working USB ports. Below are a few methods that will help you troubleshoot USB ports at the software level.
If USB ports suddenly stop working, and USB devices are not detected, then most in a simple way The fix for this sudden problem will be to restart your computer. Just restart your computer. If there were no problems loading the drivers, then this problem will be fixed after a reboot.
Update hardware configuration in Device Manager
If restarting the computer this moment is not desirable (for example, due to the performance of some important operation), then you can “reload” the drivers without restarting the entire computer via device Manager. To launch it on the shortcut " My computer» click right click mouse and select the menu item " management e". Or in the menu Start» find the program « Run” 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 on the tab " Action", then point to " Update hardware configuration". See if the section " USB controllers". If yes, then your problem is solved, USB ports should work.
Another way to get the USB ports working is to disable 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 USB partition controllers. On each of the devices in this section, right-click and uninstall them all. Once you have removed all controllers, simply restart your computer. The controllers will be reinstalled and the USB ports will be available again. This may solve your problem.
Update USB Controller Drivers
Another reason for USB ports not working is corrupted 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 (through it). Installing the correct driver should fix this issue in an instant.
Disconnecting other USB devices
Sometimes USB ports don't work because they get overloaded when too many USB devices are connected. USB hubs sometimes do not provide enough power for devices connected to it. The connected device may consume all the allowed power of the computer's USB controllers. If the equipment is connected to a USB hub, simply plug the device directly into 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 have been physically damaged. Or the USB controller is damaged, in particular the south bridge of the motherboard. In this case, the best thing you can do is to have the USB port controller replaced or repaired at a service center.
It happens when USB ports stop working on computer. In this article, we will look at the common causes that lead to such a problem, and how to solve it. The very first thing to do is restart your computer, as frequent problems with USB ports are due to an error in the driver. If this method does not help, go ahead.
Perhaps the settings in the BIOS of the motherboard have gone astray. If the corresponding usb controller is disabled for some reason, it must be enabled. When starting the computer, press the Del or F2 key to get into the BIOS. Next, in the Integrated Peripherals or Advanced section, we will find a similar item on the USB Controller and look at what position it is in (Enabled - enabled, Disabled - disabled). So, if you have the Disabled mode set, change it to the opposite. To save the changes, press the F10 key and agree by pressing YES. After the reboot, the ports should work, if it doesn’t help then follow the steps below.
Reasons why USB ports on a PC do not work:
- Faulty any USB device: I recommend turning on the computer, after turning off everything (mouse, keyboard, printer, webcam, etc. devices). Leave only one working flash drive. If the flash drive works when you start the computer, then the peripheral devices are to blame. You can determine which one is faulty by connecting it to a computer in turn.
- ports may not work due to faulty program code. We go to "Task Manager".
We carefully look in the paragraph "Controllers of the serial USB bus”, if there is a device with an exclamation mark, then this indicates that it is not working properly. Double-click to open it, and in the window you can read information about the malfunction.
- Alternatively, you can delete all controllers responsible for USB, and then reboot the system. After starting, Windows will automatically reinstall them. After that, it is likely that the USB ports will work.
- If the problem with the ports is due to a failure in program code, then you can try to restore the operating system, that is, roll it back to the last checkpoint. We go to the "Start" menu - "Control Panel". Here we find the section "Recovery".
Next, click the "Start System Restore" button. A recovery window will open and you can use the prompts to roll back the system.
- Also, a similar problem may occur due to the lack of a driver for the motherboard chipset. In this case, you need to drive this data on the manufacturer's website. After downloading and installing the driver, you should restart your computer.
- To make sure the problem is in the system or hardware, you can boot from any Live CD. If, after booting from such a disk / flash drive, the ports work, then the problem is definitely in the operating system and there is only one way out - to reinstall Windows. If USB does not work in the virtual system, then the problems are in the hardware. In this case, we do what is written below.
There was a case with a friend when the ports stopped working. Replacing the 3 volt battery on the motherboard solved the problem.
- Alternatively, you can update the BIOS. This solution helps many users. To update the BIOS, go to the official website of your motherboard manufacturer and in the "Download" section find latest version BIOS. There you will also find detailed instructions by update.
- If you have frequent problems with USB ports, I recommend installing a PCI-USB controller. Nice thing to be independent of your built-in ports.
- The last option is to send your PC in for repair, where professionals will probably make an accurate diagnosis.
That's all, friends! Thank you for your attention!
In work computer technology Various failures and malfunctions may occur from time to time. Many users are often looking for an answer to the question: why does the USB port not see the device? In fact, the connection of USB devices to the computer may not be detected by the operating Windows system due to an error.
Who is to blame and what to do?
The first thing to start with finding out the reasons for this "behavior" of the system is to check the health of the device connected to the computer. To do this, you can use another device.
If the error repeats on another computer, it can be concluded that the USB device being connected is the cause. Whether to hand it over for repair or buy a new one is a decision at your discretion.
One of the reasons for the error may be the presence of bad contacts. “Guilty” in this, as a rule, is the long-term operation of mice and keyboards of the wired type. Constant kinking of the cable can damage the inner wire and cause this problem.
Very often the error occurs due to static electricity. USB devices are a kind of storage media electric charge, therefore, when they are connected to computers, an electrostatic field often arises and the voltage rises. In this case, the protective system is activated, and all ports for connecting USB devices are automatically disabled.
How to fix the problem?
There are several ways:
- First of all, you need to disable computer device from power supply. If you experience such a problem with a laptop, you need to free it from battery. When the above steps are completed, wait 5-10 minutes, return the battery to the laptop, and connect the computer to the network. To your surprise, the ports will work!
- You can use another method to solve the problem. If the error occurs against the background of several simultaneously connected USB devices, you need to disconnect them. Then the device that was not recognized must be reconnected to the computer. As practice shows, this method is effective.
- If the above methods did not provide the desired result, you can use another one. One reason for the error might be incorrect installation drivers. The problem can be resolved by disconnecting all USB devices from the computer ports. After that, you need to find Windows 7 C:\Windows\System32\DriverStore\. and delete the INFCACHE.1 file on the computer.
The next time the flash drive is connected, a new correct file with exactly the same name is created.
We hope that the above information will be useful for you and will help in solving the problem.
The presence of USB ports on devices has firmly entered the life of a modern man in the street. Therefore, when the USB ports on a laptop or PC do not work, there may be obstacles to comfortable work. An idle port can interfere with the operation of a printer, scanner, and other external drives information.
Port Rules
First of all, to prevent damage to connectors, it is recommended to follow several simple rules:
- avoid connecting devices with noticeable damage to the port or case, burning smells or other signs of failure to work to the USB connector;
- do not overload ports, resorting to the help of 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 breakdowns.
The warranty when buying equipment often does not cover USB ports. This is due to the high probability of their breakdown by inexperienced and inaccurate users who do not believe that working with a laptop and especially ports is necessary according to any rules.
Factors leading to malfunctions and ways to solve them
In order to quickly and most effectively eradicate the problem when the USB ports on a computer or laptop do not work, it is enough to understand why the port specifically does not work. The main causes of failures and breakdowns are:
Hardware obstruction
This may be dust, damage to the external cable or the controller itself, an unconnected block, lack of power, and others.
These problems can be solved with:
- replacement of broken components in a laptop or computer;
- checks - whether all parts are connected and working correctly in system unit and laptop;
- systematic maintenance of the cleanliness of the laptop and other actions related to the technical side of the issue;
Obstacle in the software part
Since the device communicates with the operating system using drivers, many problems can be caused precisely by their inoperability. In this case, some simple ways can help:
- disable the controller through the device manager. Another way related to the manager can be to disable the controllers by deleting them and then rebooting the device. The controllers will be reinstalled and the ports will work;
- updating drivers. If there is a defect in the drivers, then you can find new ones and reinstall them. Installing the correct driver will solve the problem and everything will start working. Often there is a difficulty when, after updating the drivers of other components, the USB ports do not work. Then it is necessary 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 exactly where the breakdown occurred: the south bridge, the motherboard, or something else and solve this particular problem;
- turning off others USB devices. Disconnection of ports can occur due to their overload and lack of power. In this case, stopping other USB devices will help.
There is also a reason why the USB port does not work specifically on the motherboard of a laptop or computer. It is possible that a short circuit has occurred on it. To avoid this, systematic cleaning of dust from it, checking that it is firmly fixed and does not hang out, and removing static electricity before work will help to avoid this. 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 solution for work can be a PCI USB controller. However, if the south bridge burned out, then this will not help. With this option - only a trip to the master to replace the bridge. It is impossible to fix such a malfunction on your own, due to the fact that replacing the bridge is a complex and time-consuming job that requires specialized tools and skill.
Programs for control
Assistant in diagnostics USB work for the user can become special programs, designed to identify all connected devices and their status. It is in the program that you can see which of the devices “conflicts” with the equipment, which will significantly reduce the amount of time spent searching on your own. You can find these programs on your own on the Internet, they are freely available, free, and their choice 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 the hard drive of the PC contains important information to which you want to restrict access. Additionally, such blocking will prevent malicious software, which can be located on a drive inserted into a computer or laptop.
In large enterprises and offices, leakage of information from laptops can be prevented by using a program that, when using the port, will execute a script programmed system administrator. In this version, the program works as a "watchman".
Repair
If, nevertheless, the USB ports on the computer or laptop stopped working and nothing helped to solve the problem, then replacement of the connectors is required. You can do this yourself at home, or by contacting a specialized service where specialists will work on this.
For self replacement port will require 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 computer structure, because it will need to be not only disassembled, but also assembled back in the correct sequence. It is important to understand that in this case there is a chance to do something wrong and everything will stop working. In the future, the services of a master 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 a home version. But in the services for replacement, various ports are available, which can be selected taking into account the size of each particular computer or laptop. Also, the advantage of contacting the workshop will be a guarantee for the work performed, which will allow you to apply again if the repair turns out to be of poor quality. In this case, the main thing is to responsibly approach the choice of a workshop so that the money is not wasted.
In general, connector malfunctions on laptops and computers are easy to fix. You can do this both personally and with the help of a master. Timely prevention of malfunctions will extend the life of computer or laptop components and avoid extra costs for a fix.
Have a great day!
Of the many technologies that have had a major impact on Computer World, the advent of USB (Universal Serial Bus) is one of the most important. USB ports rarely cause any problems, but if they do, they are quickly resolved.
Consider the main problems with USB ports and how to solve them:
USB port not working - what to do?
Any hardware device interacts with the operating system through a driver. In most cases, the problem with hardware devices occurs due to installed drivers. The same goes for USB ports. Here are some ways to troubleshoot USB problems at the software level:
Just restart your computer
If the USB ports stop working, then just try restarting your computer. If there are any problems with loading drivers, then the next time you boot your computer, they will be resolved after a reboot.
Device Manager Update
If restarting the computer did not help, then. For Windows XP, click START -> Run and in the text entry area type devmgmt.msc. In the window that appears, right-click on your computer name and select Update hardware configuration.
Disabling the USB controller
Another way is to uninstall and then reinstall the USB device controller. To do this, run . In the list that appears, find USB controllers. Right click on these controllers and delete them all. After removing all controllers, restart your computer. After reboot computer USB controllers will automatically install.
USB Driver Update
Another one possible reason USB ports not working are corrupted USB drivers. Find USB drivers on the motherboard manufacturer's website and install them.
Wrong
Perhaps the USB ports are disabled in the BIOS. To enable them, go to the BIOS and find USB settings ports. For details on the settings for your motherboard, see the motherboard manual that came with your computer. Read the note about BIOS
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