G5 switches off at startup

All of the previous posts that dealt with this issue were archived with no resolution so I couldn't join in.
Problem: my wife while using our G5 suddenly heard the fans rev up to where she described the sound as a vacum cleaner. She shut down twice. On the 3rd startup attempt the sound didn't reappear. Later while I was online the computer locked up so I had to force shutdown. My first several attempts to start up the computer resulted in the G5 hanging at the blue screen. After that, I would get to the grey screen with the Apple logo and spinning symbol at the end of which my 2 monitors went dark and I heard no further sound from the hard drive.
My troubleshooting so far:
1. The G5 starts fine in Safe Mode so I downloaded the most recent Apple update.
2. I updated the disk permissions using Disk Utility.
3. Started up from a 2nd system on a Firewire IDE drive and ran DiskWarrior. Startup from the external disk also switched the computer off so I had to work in safe mode here as well.
4. Attempted to start up from the installer CD with the option key held down to run hardware test. Startup in this mode locked up on several trys so I couldn't run the diagnostic.
This is the extent of my troubleshooting bag of tricks as one or all of these options solved most problems in the past. Any ideas?
G5 Mac OS X (10.3.9)

If you're right then I may be paying someone to push that button for me, but worse things have happened. I used to do something similar with my old PowerComputing machine. It was a little red button that you had to hunt around the motherboard to find. It wasn't easy to spot at first glance. If I am not mistaken, this operation is akin to zapping the p-ram.
For future reference, are there instructions in the G5's manual for finding & resetting the cuda button? If not can you direct me to online instructions? My old PowerTower Pro's manual didn't mention the cuda. Instead I learned about it from a PowerComputing user's forum.

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Message was edited by: eww

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G5 switches off at startup

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