G4 MDD Will Not Boot After Chime

My G4 was working fine earlier in the day. I came home later and pressed the power button. I heard the chime and nothing else happened. The screen is black. I thought it might be the monitor but I plugged in into another computer and it works fine. I noticed no peripheals were lighting up such as my macally mouse so I thought it might be a motherboard problem. But first I tried brand new RAM and I replaced the PRAM battery. No standard techniques such as resetting PRAM worked, so I bought a new motherboard and still a chime but no boot.
I took it to an Apple store where they plugged in an Apple mouse and it lit up. So I thought it might be the video card since the fan on it doesn't spin. But I just got a replacement for that today and still nothing, unless I'm Missing drivers for the card, although it's a Geforce4 Titanium with S-Video out so it's slightly different than the original which was a Geforce4 Ti that came with the G4 MDD series, but I STILL get no boot. I'm out of ideas. Any help or insight would be greatly appreciated.

Well, I just tried booting my G5 into target disk mode on a powerbook G4 and only my SATA drives and my iPod mounted. I also have 3 internal ATA drives connected via a sonnet Tempo Trio card that weren't seen. In light of this and the previous post, the fact that you only see your master drive makes sense.
I would guess that you're going to have to back up all data from your system drive under target disk mode and then re-initialise it and reinstall OS X. It would probably be a good time to update to Tiger, or at least Panther at this stage, if you can afford it. I must stress that this is only guesswork on my part as I'm obviously not actually able to look at your system in person. I would also guess that all your data on your additional drives is safe.
I'm quite surprised that diskwarrior crashed and burned but this would suggest that the version of OS X for intel has ammended the formatting on your system drives so that the older, cut-down, version of OS X that diskwarrior boots from cannot read. My gut feeling says that you need to re-ammend the formatting to its original state and that this should be do-able.
I'm sorry that I can't be more helpful right now.
G5LC, G4 1.4 GHz cube, 15 1.67 GHz & 1 GHz PBs, 800 MHz PB Mac OS X (10.4)
G5LC, G4 1.4 GHz cube, 15 1.67 GHz & 1 GHz PBs, 800 MHz PB Mac OS X (10.4)

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