Tiger on a G5 will not boot even from the CD after PS failure

While the G5 was running, it has a abrupt power supply failure. Since it was just out of extended warranty, I bought a power supply and installed it. After pressing the power button, it only gets as far as the gray screen with the Apple logo. After a minute, the fans start on high. Trying to start on the CD, both Apple and Techtools, and the same happens. Safe mode and single user has the same effect, just to the gray screen with the Apple logo.
But when Command, Option, Shift, and Delete are held down, the screen tries to start with some text and then shows the "must restart" box similar to a kernel panic.
I can run the hardware test and the hardware checks out fine.
I tried unplugging the HD, re-setting teh PMU (if I did it correctly), and safe start. All with the same results.
Any ideas?
Thanks for looking.

This may be too little, too late for you, though I hope it's helpful, but maybe someone perusing this discussion might benefit:
My problem has been slightly different; my computer, after a few months of perfect operation has started to suddenly shut down.
No one has yet mentioned in this discussion that certain G5s have a hardware problem that Apple will fix for free. See:
http://www.apple.com/support/imac/repairextensionprogram/
and
http://www.apple.com/support/imac/powersupply/repairextension/
My G5 apparently qualifies for this repair. Now to see if my Italian dealer will honor it . . .
I HAVE POSTED THIS ELSEWHERE FOR PEOPLE WITH SIMILAR PROBLEMS
CIAO!

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