Computer USB is not recognized how to do?

Computer failure Solutions We are generally the first software after the elimination of hardware, elimination method in the computer fault handling is very common, solve the problem is first from simple to complex step-by-step to troubleshoot.

Here we introduce USB mainly computer peripheral products for introduction, such as USB mouse, keyboard, speakers and so on.

USB Unrecognized we are mainly following a few ideas, first of all, if you are the first time on a computer, when the USB is not recognized, we need to do is to analyze whether the problem of USB device products or computer or circuit problems, as well as the existence of a driver problem.

When the USB device has been used before, it can not be used now, the problem of driving is simply ruled out.

System Encyclopedia recently, a computer has been unable to recognize the USB error, bought a new USB mouse for less than 2 months, yesterday suddenly did not put in the computer, the mouse led a shiny, computer desktop right foot tips: "Unrecognized USB device", the following figure:

Unrecognized USB device

After checking that the USB device interface is fine, in addition to my computer---properties--in the device management found that the driver is not a problem, so the editor will be the USB mouse to get another computer to use, found that the problem is still, from this can be roughly judged to be the USB device itself, because the mouse did not use how long, The general bad possibility is not small, often carefully observe the mouse line found in the middle end of the mouse line has a very small part of the wire is worn out, and the wires inside the copper wire are exposed, after the author will grind a piece of cut off, after a good line after the problem solved.

In fact, the USB device can not recognize the solution is very simple, but is around the end is a USB device or computer problems, we only need to use the elimination method can be simple to judge, and gradually narrow the scope of the problem, the problem is much better resolved.

Here are some conditions to ensure that your USB device works:

(1) The USB device itself has no problems--it can be tested on other computers to ensure it works;

(2) There is no problem with the USB interface--it can be tested on this interface by connecting other USB devices;

(3) USB device driver has been properly installed, if there is a detailed description of the book of the USB device, be sure to carefully check the corresponding documentation, according to the instructions to install the corresponding driver;

The current operating system is sufficient to identify the vast majority of USB devices, if it is a driver problem, recommend that you use the Driver Wizard to detect and install.

When on another computer can be used, on their own computer is not used, that is, if the computer problems caused by USB is not recognized, then we need to check the computer settings, such as:

1. Front USB cable Connection is wrong.

This type of failure occurs when the USB cable on the motherboard corresponds to the front USB connector on the chassis, which is also quite dangerous, because the positive and negative connection is likely to cause the USB device to burn.

So as far as possible with the chassis behind the USB interface, but also less use extension cord. It may also be a problem with the fracture, change the USB port to see.

2.USB interface voltage is insufficient.

When the mobile hard disk is connected to the front USB port, it is possible that the system does not recognize the fault of the device.

The reason is that the power of mobile hard disk is relatively strict, the front interface may not provide enough voltage, of course, inferior power supply may also cause this problem.

The solution is to move the hard disk do not connect to the front USB interface, replace the inferior low-power power supply or try to use the external power of the hard disk box, if there are conditions.

3. Compatibility issues with the motherboard and system.

The most notable of these types of failures is the NF2 motherboard and USB compatibility issues.

If you encounter this problem on the NF2 motherboard, you can install the latest NFORCE2 dedicated USB2.0 drivers and patches, the latest motherboard patches and operating system patches, or not, try refreshing the motherboard BIOS can generally be resolved.

4. System or BIOS problem.

USB devices cannot be identified in the system when you disable USB in the BIOS or operating system.

The workaround is to turn on the options associated with the USB device. is the boot press F2 or DEL key, into the BIOS, the Enable USB device select Enable.

5. Pull and plug to be careful, read and write must not pull out, or it may burn the chip.

XP in the taskbar more than a USB device icon, open the icon will be shown in the list of U disk devices, choose to deactivate the device, and then you unplug the device, this will be more secure.

System error "Unrecognized USB device"

Failure phenomenon: The use of U disk when the computer unexpectedly power off, reboot after the U disk can not be used normally, plug the system on the error "Unrecognized USB device."

The same error message will be prompted with other USB interface devices that used to be normal.

Plug the USB device into the other USB connectors on your computer to work properly.

Analysis failure: From the phenomenon, the USB device and motherboard interface are not damaged, suspected to be accidental power loss caused system setup error.

Problem handling: Enter the Add and Remove Hardware window from the Control Panel, remove all USB devices, and reinstall the USB device drivers that you need to use.

Restart the computer, U disk and other USB devices plug in the original fault interface to work properly.

Unrecognized USB device-laptop hard drive failure and removable hard drive, plugged in front USB connector, unrecognized.

A big reason for this is the power supply problem. Because the USB hard disk in the work also need to consume a certain amount of electricity, if directly through the USB interface to take electricity, it is likely to appear power supply.

As a result, almost all mobile drives come with a separate external power supply or a PS2-turn interface that is powered by a keyboard. At this time as long as the prior connection to the external power supply or through the PS2 to connect with the keyboard, to ensure that the mobile hard disk to provide enough power after the test, then should be normal use of it.

It is important to note that it is recommended that you make sure that you have enough power before using a removable hard drive, or you may be damaged by a lack of power.

For a friend who has never used a USB add-in, it is possible that the system cannot detect a USB hard drive even if the driver is properly installed, mainly because the default CMOS port on the motherboard is turned off, and if it is not set to open, Then Windows naturally cannot detect the removable hard drive.

To solve this problem, we can reboot, enter the CMOS Setup window, and in the "Pnp/pci CONFIGURATION" column, "Assign IRQ for USB" is set to "Enable", This allows the system to assign an available interrupt address to the USB port.

It is also possible that the USB interface type does not match, causing the removable hard drive to be unusable.

For example, the computer configured USB interface is 1.1 standard, and the purchase of the mobile hard disk is the USB 2.0 standard interface, which requires connecting the computer and mobile hard drive connector must support the USB 2.0 standard.

Because a high-speed mobile device is plugged into a low-speed hub, the device may not be installed properly, and some friends use a USB drive while using a mobile hard disk, which makes it easy to use the 1.1 standard connector that comes with the USB 2.0 standard, which results in the correct identification of the mobile hard drive.