G5 won't startup from any source w/out kernel panic

I've got a Power Mac G5 dual 2GHz 1.5GB RAM, 160GB HD. It's running 10.5.6. It kernel panicked the other day while I was at work and when I came home the fan was running really loudly and the screen o' death was up. Tried restarting a few times and each time when the gray screen with the Apple logo comes on it panics again after a few seconds. Tried starting up with a Leopard install disc and it does the same thing. Single user mode, still can't get to prompt it panics in the less elegant UNIX-y screen o' death.
The only thing I can do is startup in Firewire target disk mode or open firmware. I've tried resetting nvram in OF but that did nothing.
Anybody got an idea of what could be causing this, or anything I can do besides backup my data and ship it off to a repair center? Thanks in advance for any clues.

Pull the hard drive(s) and try.
Hopefully you have external backups; a solid UPS; Alsoft Disk Warrior or TechToolPro.
Then try booting into OF again. Normally that is the first thing I would do, and if it won't do even that, then start looking at resetting PMU; pulling RAM; checking video card; AND pull out your Apple Hardware Test CD.

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MrHoffman wrote:
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beatle20359 wrote:
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Hi, yoshi -
I just have to be rush to get the cd in the drive and then to hit cmdshift+optdelete before it's too late...
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A feature not discussed in that article -
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Hey,
New member here.
I have an Imac 20" 1.8 Ghz PowerPC G5, running Mac OS X 10.4.9.
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To Apple Discussions.
Please check out the following thread which the original posted had the same error you had.
http://discussions.apple.com/message.jspa?messageID=4459207#4459207
You may find some helpful troubleshooting solutions in the above thread.
Make absolutly sure you are using the "DVDs" that originally came with the computer.
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G5 won't startup from any source w/out kernel panic

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