233 MHz Rev. A iMac won't start - Any ideas?

I have an original Rev. A 233MHz iMac that served me well in its time. I have a GameWizard card in the mezzanine slot and ~256MB of RAM in the upper memory slot. The last time I used this machine with any regularity I was dual-booting 9.2.2 and 10.2 without a hitch. However, it's not gotten any use in the past 6 years or so until recently, when I thought I'd wipe the drive and install Ubuntu for kicks.
Here's my problem. When I power on the computer, the fan kicks on and the power light glows amber. That's it. No chimes, no beeps, no drive activity, no sign of life at all. Pushing the power button does nothing - I have to yank the A/C cord out of the back to shut it off. I've replaced the PRAM battery, checked the seating of the processor card, and examined the RAM chips. Everything looks good. I unplugged the onboard video cable and tried to boot, but still no joy, so I'm reasonably sure it's not the flyback transformer. I've looked all over these threads but couldn't find any that were definitively answered, so I'm trying again.
Anyone have any experience with this issue in the original iMacs? I know I can buy replacements on eBay for crazy cheap but I'm quite sentimental about this machine and don't want to call it dead just yet.
Thanks in advance,
Chris

My favorite was the first Star Trek Elite Force game. That pushed that Voodoo card to its limits, and it ran surprisingly well. It was almost unplayable using the stock graphics. I'm sure my 466 MHz G3 upgrade helped too (it's an early pre-bankrupt Newer Tech card before the later G4 products and even before the first Mac OS X release).
Back to the problem... Try disconnecting the internal video cable that connects the chassis (with the motherboard, CPU, and drives) to the rest of the iMac's body. With it disconnected, power it up; does it sound like it is starting up when you press the power button? Obviously, you won't see anything on the screen, but the button should turn green and hard drive should make sounds like it is starting up.
If that works, you can shut it down (after it completes the startup sequence) by pressing the power button and then Return. And that would most likely indicate a problem with the analog video board (aka PAV). It works now because you are bypassing the internal video, and the iMac passes the startup hardware test.

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