USB ports do not work in windows. "Served to eat", or Problem with food. Installing the causes of failure on the computer and solutions

It is recommended to disconnect USB ports as a precaution, namely when connecting flash drives, external drives or other USB devices in order to infect the computer with all kinds of viruses or steal data. It is for these reasons that many IT specialists in offices and companies block access to them. Without bothering with any programs for these purposes or other settings, they simply disconnect from the motherboard.

Next, I will give a few examples with descriptions, how to disable USB ports on a computer.

Disable USB in BIOS

We go into Bios, for this, when turning on or restarting the PC, press the Delete key on the keyboard. Go to the Advanced (Advanced BIOS features) section, where we are interested in the next Legacy USB Support option. By default, it has the position Enabled and is changed to Disabled.

Save the changed values ​​by pressing the F10 hotkey and exit.

Through the register

Press + R to open the "Run" window and enter the Windows command "regedit" (without quotes). In the editor, go to the branch

Microsoft Registry

HKEY_LOCAL_MACHINE \ SYSTEM \ CurrentControlSet \ Services \ USBSTOR

Find the DWORD parameter "Start" and change its value to "4".

Reboot, after pressing the "OK" button.

PS: How to enable USB ports? Change the value back to "3".

Device Manager

Open the "Start" menu, right-click on "Computer" and go to "Properties". On the left side of the screen, click on the "Device Manager" link. In the displayed list, look for the item "USB Controllers", open it and deactivate it with the mouse.

Going to "Properties".

Then "Drivers" and then click the button shown in the screenshot below.

Removing USB Controller Drivers

An option that also has a place to be. Simply using a program, for example, Ccleaner, you remove drivers from your computer. The downside is that when you restart the PC it will check for them and install them. Which again will re-open access to the ports.

Fix It Utility

You can download and at the same time find out how you can use it to deny admission by following this link //support.microsoft.com/ru-ru/kb/823732.

Using programs

There are quite a few applications, you can't list all of them, but I would like to become one of them. Its name is USB Ports Disabler. Download from the link. We start and then everything is intuitively clear.

First, press the button highlighted in the figure below

Quite often people ask us why the USB ports on a laptop or computer do not work. USB ports may stop working after reinstalling Windows, after updating drivers, or at any inopportune moment. Of course, the problem may be a malfunctioning USB ports, but before taking your laptop / computer to a service center, you should check the settings to make sure that the problems are not in the software.

So let's see what you can do in a situation where the USB ports on your computer or laptop are not working.

Check USB ports

The first thing you need to do is check the USB ports for physical damage.

A simple test is as follows: plug the USB device into a port on your laptop and see if the connected device moves up and down easily. Be careful! You should not jerk the USB port too much to avoid breaking it.

In case the USB port moves too freely, it is likely that the problem is physical damage. You should contact the service center to replace the USB port.

To restart a computer

Alternatively, you can try the good old method of any tech support department: turn it off and on. Sometimes it does work because the operating system scans the hardware again, including the USB ports, making them work.

If that didn't work and the USB ports still don't work on the computer, then it's time to check the Device Manager.

Check device manager

You can run Device Manager in several ways, but we will tell you about the fastest: press the Win + R keys, and enter devmgmt.msc. Click on "OK" or key « Enter». Device Manager should immediately appear on your computer screen.

In this window, we are interested in the section " USB controllers". Click on the arrow next to this caption to expand the section. You will see something like the window below:

Here you should find a device that has words USB Host Controller in its name. For example, in my case it is Intel (R) 5-Series / 3400 Series Chipset Family USB Enhanced Host Controller... You may have different letters, but in general you should have a similar device. If it simply does not exist, this is probably the problem why the USB ports on the laptop do not work.

In this case, you should right-click on " USB controllers"And choose "Update configuration". The computer will re-check the hardware and you will see the USB Host Controller listed.

Remove USB Host Controller

Next, you need to act carefully. If you are working on a computer, then most likely you have a USB mouse and keyboard connected. After you remove the USB Host Controller, your mouse and keyboard will not work. This is not a problem as they will work again after restarting your computer.

So, as you understand, you should right-click on the USB Host Controller device, and select " Delete". Perform this step for all devices named USB Host Controller.

After removing USB Host Controller, restart your computer or laptop. After restarting, the computer will automatically install the necessary drivers for the USB ports to work.

Find the DisableSelectiveSuspend registry key

If the USB ports are still not working, then we will go even further - make some changes in the Registry Editor.

To go to the registry editor, press the keys Win + R, enter regedit, and press the " Enter". The Registry Editor window will open.

Next, you need to find the registry key DisableSelectiveSuspend... It is located in the following folder: HKEY_LOCAL_MACHINE -> SYSTEM -> CurrentControlSet -> Services -> USB... Next, in the right window, right-click on the file “ DisableSelectiveSuspend", And select" Change».

In field " Meaning»Enter the number 1 ... This will disable the selective suspend feature and power will be continuously supplied to your USB ports.

If there is no USB folder

If the USB folder does not exist in your registry, it is easy to create it. Just go to the Services folder, then on the toolbar, click Edit»> « Create»> « Chapter". Name it USB.

Next, select the new USB partition, right-click in the empty window on the right. You will only have the option “ Create". Click on it and select the value " DWORD parameter (32-bit)". Enter the title DisableSelectiveSuspend.

As we wrote above, right-click and select Edit. In the Value field, enter the number 1. For the changes to take effect, you need to restart your computer.

Ready! Our tips should help in a situation where USB ports on your computer stopped working. If you know other reasons why USB ports on a laptop do not work, and how to fix it, write in the comments below.

Hello everyone! Today we will consider several questions at once on the topic, how to connect USB to the computer. First, we will learn how to connect any device to a PC or laptop. And secondly, I will tell you how you can connect to computer additional USB ports if you are missing them for all devices. So let's go!

The USB port is by far the most common type of device connection to a computer or laptop. There are three data connectors - 1.0, 2.0 and 3.0. If the first one can now be found only on the oldest computers, then the second and third are used today. In essence, they differ in data transfer speed. And in appearance, which is more important for us now - color. USB 2.0 has a black connector and plug, USB 3.0 is blue. You can read more about the specifications and differences in standards.

Before connecting the USB cable to the computer, look at the plug of your gadget - if the blue connector is plugged into the black port, then the device will not use all its speed characteristics to the maximum. If you plug the black plug into the blue one, then absolutely nothing will happen - just the USB 3.0 port will work at the speed that is maximum for 2.0.

So, we look at the back panel of our computer, find the USB port of the same color as the plug, and plug it in.

After that, the device will either be detected by itself in the system, if it is a keyboard, mouse, webcam or some other simple and widespread device for which Windows already has a driver. Or, to work, you will need to install the software that comes with the device on CD.

How do I connect additional USB ports to my computer?

Any modern motherboard already has built-in USB ports - both 2.0 and 3.0. However, usually we connect so many different peripherals that they may simply not be enough, for example, in order to connect a USB flash drive or an external drive and upload fresh photos to it.

Connecting a USB bracket to the rear panel

What to do? There are two ways. The first, preferable one, is to buy a separate bracket with USB ports and insert it into additional slots on the rear panel of the case - into the same slots where we attach a video or sound card, a wireless adapter, and other components that are connected directly to the board. It looks like this:

In order to accomplish this task, the motherboard must support the connection of additional USB ports. This can be determined by the presence of connectors on the motherboard labeled USB or USB 3.

The connectors for USB 3.0 are large, have many contacts and are designed to connect two ports at once in one plug.

USB 2.0 is smaller and each of them can be connected to 2 ports separately.

Accordingly, we look at the presence of such connectors on the motherboard, buy the corresponding brackets, fix them in the back of the case and connect them to our connectors.

Connecting a block with USB ports instead of a flop

Another variation of this method of increasing the number of ports is a special block with USB, which is inserted in the front of the case instead of the old floppy disk - flopik 3.5

There are many options for the execution of such a block. For example, combined for connecting USB 2.0 and 3.0

And in the following example, the USB 2.0 ports are combined with the microphone and headphone jacks

The connection of such a block occurs in the same way as the above-described bar - to the corresponding connectors on the motherboard.

External USB hub

Finally, another option for increasing the number of ports is to buy an external USB hub. However, there are a number of disadvantages because of which I would not connect any serious equipment through it, but would only use it for flash drives or, in extreme cases, mice.

Since this is a hub, all the load from several of its ports goes to one single computer to which it is itself connected. Due to this overload, certain devices may periodically fall off, which is not gut. If you connect a hard drive to a USB hub, then the power supplied through it may not be enough for its operation. Therefore, we leave this method only for light fast food - flash drives.

The presence of USB ports on devices has become a part of the life of the modern man in the street. Therefore, when the USB ports on a laptop or PC do not work, there may be obstacles to comfortable operation. An inoperative port can interfere with the functioning of the printer, scanner, and all kinds of external storage devices.

Port rules

First of all, to prevent connector breakage, it is recommended to follow a few simple rules:

• avoid connecting to the USB connector devices with noticeable port or casing breakdowns, burning smells or other signs of inadequacy in work;
• do not overload 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 failure.

Hardware purchase warranty often does not cover USB ports. This is due to the high probability of their breakage by inexperienced and sloppy users who do not believe that working with a laptop and especially ports should be done according to any rules.

Factors leading to malfunctions and their solutions

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

Hardware obstruction

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

The listed problems can be solved with:

• replacing broken components in a laptop or computer;
• checks - are all parts connected and working correctly in the system unit and laptop;
• systematically maintaining 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 methods can help:

• disabling the controller through the device manager. Another way associated with the dispatcher is to turn off the controllers by removing them and then rebooting the device. The controllers will be reset and the ports will work;
• updating drivers. If there is a defect in the drivers, you can find new ones and reinstall them. Installing the correct driver will fix the problem and everything should start working. There is often a problem when, after updating the drivers of other components, the USB ports do not work. Then you need to determine: a problem with the drivers for the device using the connector, or directly in the effectiveness of the port itself. In the first case, the installation of 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;
• disconnect other 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. This can be avoided by systematically cleaning it from dust, checking that it is firmly fixed and not dangling, and removing static electricity before work. If the ports on the motherboard stop working gradually one at a time, then you need to prepare for changing 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 burns down, it will not help. With this option, only a trip to the master to replace the bridge. It is impossible to eliminate such a malfunction on your own, due to the fact that replacing a bridge is a difficult and time-consuming work that requires equipment with 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 of the devices "conflicts" with the equipment, which will significantly reduce the amount of time spent on searching on your own. You can find these programs yourself on the Internet, they are freely available, free, and their choice is quite large. Here are some of them (there is a download link in brackets):

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 important information is stored on the hard disk of the PC, to which access should be limited. In addition, such blocking will allow you to avoid malicious software that may be located on a drive inserted into a computer or laptop.

In large enterprises and offices, information leakage from laptops can be prevented by using a program that, when using the port, will execute a script programmed by the 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 the connectors must be replaced. You can do this yourself at home, or by contacting a specialized service, where specialists will work on it.

To replace the port yourself, 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 device of a computer, because it will need not only to be 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 option. But in the replacement services, there are 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 again if the repair turns out to be of poor quality. In this case, the main thing is to take a responsible approach to the choice of a workshop so that the money is not wasted.

In general, connector faults on laptops and computers are easy to fix. This can be done both personally and with the help of a master. Timely prevention of malfunctions will extend the life of computer or laptop components and avoid unnecessary repair costs.

Have a great day!

Probably, many users, connecting a USB flash drive or other peripheral device, faced a problem when the computer does not see them. Opinions on this may vary, but provided that the devices are in working order, most likely the matter is in the USB port. Of course, for such cases, additional slots are provided, but this does not mean that the problem does not need to be solved.

You don't have to be a computer genius to complete the steps in this article. Some of them will turn out to be quite commonplace, others will require some effort. But, in general, everything will be simple and clear.

Method 1: check the status of ports

The first reason for a malfunctioning ports on a computer is their clogging. This happens quite often, since usually there are no stubs provided for them. You can clean them with a thin, long object, such as a wooden toothpick.

Most peripheral devices are not connected directly, but through a cable. It is he who can be a hindrance to data transmission and power supply. To check this, you will have to use another, obviously working cord.

Another option is the breakdown of the port itself. It should be excluded even before performing the actions described below. To do this, insert the device into a USB socket and shake it slightly in different directions. If it sits freely and moves too easily, then most likely the reason for the inoperability of the port is physical damage. And only its replacement will help here.

The simplest, most popular and one of the most effective methods of troubleshooting all kinds of computer problems is to reboot the system. During this time, the memory, the processor, controllers and peripherals are given a reset command, after which they return to their original states. Hardware, including USB ports, are rescanned by the operating system, which can make them work again.

Method 3: BIOS setup

Sometimes the reason lies in the settings of the motherboard. Its input and output system (BIOS) is also capable of enabling and disabling ports. In this case, you need to enter the BIOS ( Delete, F2, Esc and other keys), select the tab "Advanced" and go to item "USB Configuration"... Inscription "Enabled" means the ports are activated.

Method 4: updating the controller

If the previous methods did not bring a positive result, the solution to the problem may be to update the port configuration. This requires:

The absence of such a device in the list may be the cause of the malfunction. In this case, it is worth updating the configuration of all "USB controllers".

Method 5: Removing the controller

Another option is related to deleting "Host controllers"... You just need to take into account that this will stop working devices (mouse, keyboard, etc.) connected to the corresponding ports. This is done as follows:

In principle, everything will be restored after updating the hardware configuration, which can be done through the tab "Action" v "Device Manager"... But it will be more effective to restart the computer and, perhaps, after the automatic reinstallation of the drivers, the problem will be solved.

Method 6: Windows Registry

The latter option involves making certain changes to the system registry. You can accomplish this task as follows:

File "Start" may be absent at the specified address, which means that it will have to be created. This requires:

All the methods described above really work. They have been verified by users who once had their USB ports disabled.