Damn, it appears that this machine isn't what it is suppose to be. The "DP 450" on the back of the case really means "SP 400" and its a PM G4 AGP Graphics. Grr. Someone must have swapped out some parts at one time or another. Double grrr.

Anyway, my question still remains. How can I bench test the PS from the other G4? I want to pull it and see if it fires up at all without risking anything in the machine.