G5 will not boot into OSX - stays at a command-line prompt

My G5 will not boot into OS X. I would appreciate and and all advice. Thanks.
What happened:
I had the G5 running one morning, with the Isight camera on, plugged into the front-console firewire port. I was running EvoCam software.
At about 2 hours into running, the cam stopped broadcasting – I got home to check it out three hours later, and the screen was black, and the fan was louder than I had ever, ever heard it on this box.
I did a hard shut-down with the powerbutton on the Cinema Display monitor.
At reboot, I see a grey screen for approx 5 seconds, with a dark grey apple logo, and then the screen goes to black, with a command-line prompt.
It’s been like that ever since.
I ran the Apple Hardware test, from the internal CD drive, and it shows no errors.
I cannot boot from an OSX installer DVD. It won’t recognize it. It goes straight to the black screen and Command line prompt.
I have re-seated the RAM, as well as the Airport Card. The only other card – which I have not re-seated, it the video card.
I am able to use the machine in Target Mode, so I can extract data from the drives, which is great. Oddly enough, I’m able to use the front-console firewire port to connect to my other Mac in Target mode – with no problems. Also – in Target mode, the fan never goes above the usual quiet self.
I would appreciate any advice one can provide. Thanks!
The machine:
Mac G5 dual 2.0 – First Generation (purchased December 2003)
It’s on it’s 3rd Motherboard – and now it’s fully out of Applecare warrantee.
OSX 10.4.9
4GB Ram
2 internal drives: 160GB + 300GB
Airport Extreme
20” Cinema Display (first generation)
Mac G5 dual 2.0 – First Generation Mac OS X (10.4.9)

Well, Apple Support does have articles on:
Isolating Issues in Mac OS X
http://docs.info.apple.com/article.html?artnum=25392
won't boot or login
http://docs.info.apple.com/article.html?artnum=106464#symp1
And if those don't work, call.
With G4 there is/was
"Fix for a Mac that won't power up
Mirrored Doors G4. When you pressed the power button, the button would light up, but the computer would not turn on. The fans on the power supply wouldn't turn on.
FIX: unplug the machine, pull the clock battery, hit the power button to discharge. Then plug it in without the clock battery. The machine should boot perfectly. Shut down, reinstall the clock battery, and now the system is fully functional. Macosxhints
http://docs.info.apple.com/article.html?artnum=300552
Reseat video? try another video card?
My Step #1 is to always boot into Open Firmware (and do reset-nvram, reset-all, if you can't do that, you are sunk).
Oh, and What do you see in verbose mode on startup?
Mac Pro 2GHz 4GB 10K Raptor 23" Cinema Mac OS X (10.4.9) WD RE RAID Aaxeon FW800 PCIe MDD-G4 APC RS1500 Vista

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jasonwryan wrote:
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