|Depends on the problem. |
One is hardware and I doubt you could fix it but maybe if a simple solder joint.
Another is the bios settings. Might look in there for any enable or such.
One is to try a cold reset. Pull battery and ac and then press power button a few times. It might help but it can't hurt to try.
Might be that some usb device is taking too much current and when you try it the usb drops off. Might be able to view windows under hardware show hidden devices.
Lastly is the OS. It may have some issue like a motherboard driver or even enabled usb.
Why did it take me over a year to phone in a problem to ATT?