Start-up problem keys won't work

Hello out there,
I have another start-up problem with a G5 2.0 GHz (7.2).
I can't use any start-up keys (such as holding c oder s).
I can't reset PRAM. Starting from CD works only when I unplug the hard drive. The keyboard works fine than.
Any suggestions?
Thanx
Thorsten
all from G3 to G5 Mac OS X (10.4.9)

I found an answer by myself.
Holding the power button after switching on brings you to the open firmware.
Now you can type:
reset-nvram [enter]
reset-all [enter]
After that the startup keys worked again.
Sometimes it's useful to refine your search

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