My desktop computer (Dell dimension series 4550) went black screen with flashing cursor.  Tried to reboot several times.  At first got:

“Boot failed at checkpoint [USBd] – Error 8602 – Auxililiary device failure – Keyboard failure”

Tried again and just get “Keyboard Failure”.  Even swapped keyboards, but the system won’t boot at all.  Tried several times to reach setup or (F2 / F12) but it won't go there...  Suggestions?

Thanks,

Tim