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Hate to be doomsday oracle, but if the KB and mouse BOTH refuse to respond it could be something going on with the motherboard and/or BIOS.
I've had a look at yy's motherboard specs and pic. It's pretty standard with PS/2 connectors. If it were a USB keyboard that may explain things as, in my experience, they seem not to respond as well as PS/2.
(*Hey, YY are you connecting your keyboard and mouse to the green and mauve round connectors at the top of the back panel or via USB ports?)
Having said that, first step is to try another working keyboard in the same port, next if using PS/2, try USB and vice-versa.
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