1GHZ dual G4 will not boot - nada

I have a 1 GHZ dual G4 with absolutely nothing other than the original OS 10.2.1 on the HD & no extra RAM installed and it will not start, not even from;
Original OS 10.2.1 install disk
Apple OS 9.1 install/ restore disk
Apple Hardware Test disk (v 1.2.6)
Single user or Safe mode
Disk Warrior CD (v 3.0.3)
New OS 10.5.1 install disk....
I usually get to the startup screen before either a kernel panic or freeze brings everything to a sudden halt - I've tried every key-combination I have read about but to no avail - any ideas before I reach for the sledge-hammer?

Hi! First make sure the battery is putting out about 3.6 volts because a weak or dead battery can keep one from starting. If it won't start from the hardware disc or the install disc then you have hardware problems. I'd start by making sure the hard drive is spinning up which gives you an indication if the power supply is putting anything out. If the hard drive is spinning I'd unhook it and try the hardware disc and install disc. If it still won't boot I'd unhook the optical drive and hook the hard drive back up and try it. If none of that works then you probably have logic board or power supply problems or both. Tom

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