I had problem connecting MP3 in my USB, reply about power surge.
I disconnected MP3 but noticed my mouse and k/b were usable.
I rebooted but still could not type or use mouse. The k/b lights for
scroll, num did not come on.
Is there a reset in the case to reset? This is a Dell Dimension 3000.
there is an existing problem if you try to connect a PS3-controller to a 64 bit windows: the usb-drivers get corrupted. solution: reinstall the drivers.
this can be tricky if you cant use a mouse and keyboard, to solve that get a ps/2-adapter to connect at least the keyboard to your pc (if you're lucky, you still have a ps-2 connection for mouse too) http://www.newegg.com/Product/Product.aspx?Item=N82E168...
(an example of an adapter, search it in your closest shop)