USB devices can not be planted

Our school's computers can not plug in USB devices.But there is one phenomenon:MP3 plug, but the charge can not be connected to computers and mp3 does not have any tips.U disk is the same, LIGHT of the U-set lighting, but Computer is not working.(WIN2000 system for the equipment manager for all USB devices can be used)

a bad drive to the next USB USB drive to try everything bad I live is the BIOS to disable the USB device! Play in the back of the main computer chassis generally above four USB interface, two behind the front two, charging that this can only be a problem, generally in front of the USB interface easily lead to shortage of power supply, it is proposed for a main chassis behind the USB interface.

……This did not come across such a situation ……