No Keyboard working in BIOS (Asus P5Q-EMD0)

I experienced the same behavior on a Beckhoff C6915-0010 industrial PC. Turns out the fix was to set the USB Operation Mode in BIOS to Full/Low Speed instead of High Speed.
I documented my findings in this post:

USB not working on older Bios

Maybe this will apply to your problem as well.

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