Have any ideas re: G5 startup issues? Long post...

My dual processor G5 (purchased Jan. 2005) is in the shop, and, of course, out of warranty. It's been down for over two weeks. Here is the story of its demise:
Installed 10.4.9 upgrade. Began having "launch systems" and crashdump/usb crash errors thereafter. Not a lot of info online regarding these problems, so I decided to do an archive and re-install of my system software.
Started having intermittent problems restarting the G5. Either it would chime, but not kick on the monitor, chime and kick on the monitor but hang at the grey apple startup screen, or not chime at all, with which only the fans would come on. Apple Extended Hardware Test came back OK. Still had problems after removing my USB devices.
Problems continued after the reinstall of the system software, eventually to the point where I could not even boot from a CD. When the G5 did operate, after a short period of use it would freeze, and I would have to force a restart and pray it would boot up completely. It would reliably freeze after waking it from sleep, but also froze in iPhoto and Finder as well.
I have tried resetting the PMU and the PRAM with no improvement. Took it to an Apple Authorized Service Center, luckily only a couple miles from where I work. They tried booting with the Apple RAM only, then the third party RAM only, no improvement. Hard drive was completely reformatted and system reinstalled, no improvement. I am waiting to hear what else they've tried.
My G5's serial # falls outside of those involved with the power supply issues. Yet, could this be a possibility? Any other ideas as to what the problem could be, or has anyone had similar issues?
I freelance as a graphic designer and this has me in a panic. Now using the hubby's Intel iMac to run CS2 and it's a drag.
Thanks in advance.

Hi and thanks for the input. I just spoke to the Apple service guy and he still insists there is not a hardware issue. Apparently there is an Apple technical doc, available only to authorized techs, that refers to this particular issue, and the fix is a download and install (firmware, perhaps?) He has to contact Apple and confirm my G5 is within the serial # range for this particular fix.
That's my best interpretation of our discussion. He was rather cryptic. But he says it's not the power supply.
I did an archive and install because, like an idiot, I did not have anything backed up at that point. After that failed, I used up my stash of DVDs and copied gigs to our iMac until the G5 gave out. I had run the hardware test several times and each time came back clean.
Permissions were repaired before and after updates; had it freeze a couple times mid-update. Tried booting in safe mode and single-user mode and still had the same startup issues.
To add insult to injury, I purchased a LaCie Porsche external drive as an eventual backup drive whenever the G5 returns. Hooked it up to our iMac to backup the items I saved off the G5. It failed after the second use. Returned for replacement.
Thanks.
G5 Dual 2.5 MHz Mac OS X (10.4.8)

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