Lost open firmware password - any way to reset?

Hi
I lent my PB to someone and I don't know exactly what happened, but now the PB can't start up. I get the flashing Finder icon and question mark, so I got out my install discs and tried to repair permissions/reinstall. But I set an open firmware password which I have now forgotten, so I can't boot up from the disc. Is there any way that I can reset the password, or somehow reinstall?
I did check the airport card, it seems to be seated properly.
I'm running 10.3.9 on the 1.33 GHz PB.
Any help will be hugely appreceiated. Thank you.
p53

Thanks Gossamer, but I can't reset the PRAM because I've lost my open firmware password.
I'm basically stuck with a PB that won't start up until I remember my open firmware password (which is unlikely) or I am able to reset the password somehow.
I didn't mention in my first post - when the PB goes into open firmware mode, the screen displays:
"Invalid memory access at SRR0: ff84a4d0 SRR1: 0000b030"
Does this indicate a problem with the memory?
p53

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