IMac g5 (isight) 20 inch won't boot up from harddrive or cd

Hey! I am going to make this all very clear and explain everything to the best of my ability (this might be long).
My friend gave me this iMac g5 with the built in iSight. The computer was not functioning properly, so I decided to see if I could find some help fixing it.
Basically, like many others, my computer is stuck on the grey loading screen, and I can't figure out what operating system it is running because of this. I asked my friend what OS it was running and he said he didn't know. I have tried EVERYTHING to fix it. Here's a list:
Pressed Option key at start (nothing happened)
Pressed C key at start with Disk Warrior in the cd drive (won't boot from cd)
Pressed C key with Tiger OSX in cd drive (won't boot from cd)
Reset the PRAM to no avail
Reset the SMU to no avail
Infact, the only thing that seems to work is COMMANDOPTION+OF ...and I don't know what to do when i get to that screen...i've been using it to eject cd's from the imac...thats about all i know.
PLEASE HELP! I DON'T KNOW WHAT ELSE TO DO!

Thankyou for your response!
Unfortunately, I have been to that support page. I cannot even get into disk utility, let alone the mac osx software.
is there anything else i can try? maybe something in open firmware since its the boot key that works

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IMac g5 (isight) 20 inch won't boot up from harddrive or cd

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