What to do when USB intermittent is not recognized

Failure phenomenon:

Do not know whether you have met such a strange thing, that is, USB can sometimes be identified to a U disk or USB mouse, but sometimes it is not able to identify the U disk or USB mouse, replacement of other U disk or USB mouse fault remains.

Solution:

USB is not recognized by the computer, if it is the system or system driven by the reasons, you can repair the following methods:

1, the boot press F8 into Safe mode after the exit, select Restart or shutdown in the boot, you can enter the normal mode (repair the registry).

2, may Windows default on the power-saving mode, resulting in insufficient USB interface, so that the USB interface intermittent failure. Open--Device Manager, double-click the Universal serial Bus controller to several "USB Root Hub" to double-click on any one, open the Properties dialog box, switch to the Power Management tab, remove the "allow the computer to turn off this device to save power" before the check, click OK to return, in turn, each USB Restart the computer after the Roothub properties have been modified.

3, if the failure is still, please use the system with the System Restore, restore to you did not appear this time of failure repair (if normal mode recovery failure, please turn on the F8 into Safe mode to use System Restore).

4, if the failure is still, using system disk repair, open a command prompt input Sfc/scannow return (SFC and/between a space), insert the original system disk repair system, the system will be automatically compared to repair.

5, if the failure is still, set the optical drive in the BIOS for the first boot device Insert system installation disk press R to select "Repair Installation" can be.

6, if the failure is still, it is recommended to reload the operating system.

There is also a reason is that the USB interface is not enough power, may be the USB interface attached to too many peripherals caused by insufficient power. It is recommended that you use a live Usbhub or a PS/2 adapter using a USB switch.

If you have a letter that is not displayed, the workaround is as follows:

Right-click My Computer/management/storage/Disk Management, then right-click the removable disk icon, click the Change Drive and Path option on the shortcut menu, and click the Add button in the subsequent interface, then select Assign Drive letter and select the appropriate letter from the Drop-down list next to the option. You can click OK. When I finally open my computer, I can see the drive letter of the removable hard disk.

Other possible situations:

1, your data line is broken, the method of detection in other people's machine with your data line on the computer to know the good or bad.

2, is the interface of your machine problem, the solution is to change the interface.

3, may be your computer system is incompatible with your machine, resulting in the computer can not recognize