Computer USB interface does not recognize the mouse keyboard what to do

Today, with a USB cable Connection notebook and mobile phone, the mouse pointer suddenly does not move, how to shake the mouse is useless, external keyboard is not used, keyboard lights are extinguished. I think it is bad, had encountered two times before, did not find a solution, the final is to reload the system to solve. The first two times, once at home, once in the school, are connected to the mobile phone when this problem, although I do not know why this, but tried the internet to say that the various methods, are not resolved.

The reload system takes too much time and energy, and it can take several hours to finish the work. This time really do not want to reload, think carefully, this question is a bit strange, even when the USB phone, suddenly cause the external mouse keyboard can not use, but U disk and other devices can continue to use. Obviously, there is no damage to the USB driver, which is certainly caused by other problems. With luck, and then Google search for a while, suddenly found a previously did not use the method, decided to try.

Solution One,

Direct shutdown, unplug the power (the battery does not take off it does not matter), and then wait, connect the power, restart on it. Follow this step to try, sure enough, haha. Although it is very simple, but not very clear principle, is not the reason for the lack of electricity? No reason Ah, anyway, I do not understand, in short, is resolved, and later encountered can be treated like this, just feel the previous two heavy fitted with a point of loss ah.

Solution Two,

USB is not recognized by the computer, if it is the system or the system is driven by the reasons, you can repair the following methods (change the interface to try, but also to another computer test, if it is not possible is a U disk repair repair go).

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, 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).
3, 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.
4, 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.
5, if the failure is still, it is recommended to reload the operating system.

If there is a letter but not shown, workaround: 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 then click the "Add" button in the subsequent interface, and then select "Assign Drive letter". Also, select the appropriate letter from the Drop-down list next to the option, and click OK. When I finally open my computer, I can see the drive letter of the removable hard disk.

If the failure persists, there may be the following reasons.
1, change the interface to try;
2, the computer has not been plugged in before the boot try.
3, the computer USB interface has problems, to take the motherboard to repair;
4, the power supply has the problem;
5, the motherboard circuit problems