Motherboard USB ports are capable of hot plug, and they can offer electrical source for peripherals that connect to them. If your motherboard USB ports are not working, the following failures may occur:
One, you can find the movable device and normally set up its driver in Windows 98, but right-click My Computer, select Properties and choose Hardware, click Device Manager to enter the Device Manager dialog box, double-click Sound, video and game controllers to see a extended list, you will find an exclamation mark beside this device. Probably the USB driver is the culprit, you need to unload your original driver and reinstall a complete one to fix this problem. To unload and reinstall a compatible driver, you can download a very user-friendly software tool named Driver Update Tool to help you perform this process automatically!
Two, your large-capacity movable hard disk doesn't work in these ports, only thumb drive and MP3 etc can work. The issue is mainly due to the voltage provided by the USB is too low while large-capacity USB disk requires relatively high voltage. Therefore you need to connect your computer to an external power supply.
Three, you can use your USB disk in the rear port but not in the front port. Because the front USB port is connected by an extension line, obviously its pressure is much lower than that of the rear one that built-in the motherboard, you can consider adding this front port a separate power equipment.
Source : goarticles by Jorn R Smith
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