Looks like you had the more common form of this USB problem where the port itself has gone bad. Luckily newer systems come with plenty of USB ports. the Issues i had, ended up being Group policy related. once i had this machine sitting on top of the servers at the admin building it worked just...
I see this thread is a little dated, but here is possibly some useful info for the problem. Have this issue on a dell 7020 desktop computer at work. it is in a lab of computers configured identically for a business lab. the mouse works fine in any port but the USB keyboard does not. took the...