Powerbook G4 17" won't boot...failed drive or logic board??? HELP!!!!

I am in need of some assistance. My Powerbook no longer works although it chimes when powered up. I have reformatted the hardrive and reinstalled a new operating but still there is no booting up.
**The question that I pose is: hardrive failure or logic board failure.**
I have tried to the Command-Option O+F, I have tried holding down the Option key (which starts the machine sporadically), I have tried the Shift key and also the DVD...nada squada on all of these.
Please help.

Have you inserted the first OS X DVD and rebooted holding the C key down? This would boot from the DVD. Are you able to do that?
Have you run the Apple hardware test? With the OS X DVD that says 'AHT Version x.x' in small print, insert it, and reboot holding the option key down. Choose the Apple hardware test, click on the arrow pointing to the right, and follow directions. Choose the extended test. Does that tell you anything?

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