DPG4 does not post -- but the power button lights up

I'm totally lost at this point... My old PowerMac no longer powers on. I managed to somehow get it to boot when I had this problem once before, but this time I'm getting nowhere. When I press the power button, the button itself still lights up -- but that's as far as it gets; as soon as I take my thumb off of the button, it goes dark, and the system doesn't even try to boot. The steps I've taken so far to troubleshoot this are: removed all third party components, (including a 512MB DIMM, a USB2 PCI card, and a 54g wireless PCI card, as well as several USB devices) removed the power cord and backup battery and pressed the PMU reset button. Does anyone have any other suggestions?
Fortunately, this is no longer my primary system -- a white 24" Intel-based iMac takes that title now -- but it would be awfully nice to be able to install one of my Leopard licenses (from the family pack) on the old G4 to use it as my Time Machine server.

Thanks for the suggestions so far.
Additional information: I just successfully booted the machine, through a series of (what I would call) almost random configuration adjustments. Here's what I did... I opened the box, yanked the backup battery and pressed the reset button again, and tried to power it on. I then noticed that the optical drive was connected to the ata33 interface. Thinking that this is a bit odd, I swapped it to the ata66 interface. (My two internal harddrives are both connected to the separate ata100 interface... is this a truly bizarre set of interfaces, or is it just me?) I then pressed the power button -- and the machine fans started blowing, and then stopped. Suddenly very interested, I promptly disconnected the power cable from the optical drive, and then tried again -- no dice. I pressed the power button a few times just to see what would happen, and I observed the fans on the rear of the power supply and one case fan were spinning up for just a bare moment about every few times I pressed the button. I then disconnected the main power interface cable from the motherboard, and did the whole pmu reset/battery out/pmu reset/battery back in series, and then replaced the power interface and pressed the power button. Voila! It powered up, so I promptly logged into the site and started typing.
Now, here's my thoughts: I would assume that the fact that it is presently booted up and running (albeit without the optical drive) rules out a failure of the front interface; do either of you concur? Also: I have not yet taken my multi-meter to the power supply, but my first instinct is to think that the power supply is just on the edge of my current wattage requirements, and disconnecting the power from the optical drive is what allowed me to boot. Correspondingly, I would speculate that this could be caused by either 1) my add-ons have exceeded the 400 watt output of the power supply, or 2) the power supply is indeed starting to fail.
So... since the machine is running at the moment, are there any diagnostic programs I could run against the power supply to find out if it's operating at design specifications? I'd expect this would be more accurate and more safe then me poking around with a multi-meter -- and it would be less expensive then a trip to a Mac repair shop, though that is certainly the next step if the power supply is dying.
Thanks again for your advice!

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Right if the Nvidia chip fails completely it takes the complete computer down with it. No start no sign of life.
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DPG4 does not post -- but the power button lights up

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