Unplug all USB devices from the PC except: Plug a single USB mouse into one of the blue USB ports, boot into the BIOS, and see if the mouse works in the BIOS.
With all 17 USB devices (yes, 17) unplugged, I booted into BIOS and plugged a USB mouse into one of the blue USB-3 ports. It worked. I tried the other three USB-3 ports. They all worked. I tried the two black USB-2 ports. They worked. I tried the blue USB-3 port on the front panel, it worked. I tried the black USB-2 port on the front panel. It worked.
After booting up into Windows, only the two black USB-2 ports on the backplane, plus the mixed pair (one blue, one black) on the front panel worked. Those four USB ports have always worked. Only the four blue USB-3 ports on the backplane have failed.
Since
everything works in BIOS, does this mean it is
not a hardware problem?
tanstaafl.
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