USB interface can not be used is not very uncomfortable, do not worry now computer tutorials with you to analyze the cause of the failure. There may be four things you should be aware of.
1.USB interface may be a problem with the system, check to see if the system service is disabled. You can also reinstall the operating system.
There is a problem with the 2.BIOS setup. In the BIOS or CMOS, after the ban on USB, USB interface is not used, you can restart the computer to restore it to the appearance of the default settings.
3. USB driver was not installed at the beginning, or the driver was accidentally deleted in a certain case, you can download a USB universal driver on the Internet.
4. It is possible that the front of the USB cable is not good, please insert a U disk into the back of the chassis USB test, can be done.
Note: Pull the U disk must pay attention to, follow the correct steps to operate the use, or this last one may be your U disk there is a problem.