Keyboard does not work when start up

I was trying to run a hardware test through Mac instal disc, but there was not response after I pressed D or C. I also could not hear the starting sound as usual, even I turned the loudest.
However, everything became normal again after the start up completed.
Can somebody help me please...

Can't remember at the mo exactly but make sure you have everything connected correctly. I think there is a not on the AHT that details where you can and can't plug in USB keyboards/mice.
Make sure that every other unnecessary peripheral is disconnected too.

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