Resetting PRAM keystrokes?

I can't remember how to do this.

My iMac won't recognize anything, and since yesterday, not even Norton Utilities startup disk?

I have Panther Systen installation disks and it won't recognize them either.

Any thought? Should I reset the PRAM - is there anything else that comes to mind?

Thanks
Joe

Previously, Joe <betabeta@optonline.net> writes:

I can't remember how to do this.

Switch of the Mac, press
Command Option P R
and while pressing these keys simoultanously switch the Mac on, keep on pressing until you have heard the startup sound three times.

My iMac won't recognize anything, and since yesterday, not even Norton Utilities startup disk?

I have Panther Systen installation disks and it won't recognize them either.

Any thought? Should I reset the PRAM - is there anything else that comes to mind?

Dirty DVD-drive? Broken DVD-drive?

Regards,
Christoph Gartmann