Startup keys don't work

Hello everyone
My iMac g5 powerpc has got problems with the keyboard startup shortcuts. It doesn't want to do anything. I have tried to use the C key, Option and about all the other startup keys I know. I have done a nvram reset, nothing changed. Tried plugging in a different usb keyboard, nothing either.
Anyone know what could possibly be wrong?
PS: I have got an intel mac also and it experiences the same problem, only there I can boot from the remote. Is it possible that I HAVE to use a mac keyboard? Because I'm currently using a logitech usb keyboard.
Thanks in advance.

Using a Mac keyboard is not required, I have used other makes without problems. Do you have another kb that you can try?

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