Cannot start dual G5 after shutting down

I have not been able to find a solution in the discussions, so I thought to post.
My dual 2GHz G5 (late 2003) was wroking fine. Suddenly the screen froze and I no longer had mouse or keyboard access. I pressed the start button for 10 seconds to shut down. Have not been able to restart since. I have tried unplugging power and resetting PMU inside case. When I press the Start button, white lamp only while holding button, no chime, hear fans spin up, can feel/hear drives spin up, but nothing after that. I maintain disks and such regularly, so not a HD problem that I can tell. Running 10.4.10 with all recent patches and updates. G5 will not start from external FW HD either. Unable to run any diagnostics, as it will not start.
Have looked through topic like this posted by others and have not seen any solutions or that issues were resolved. Does anybody have any idea what the problem and fix for this is? Only outside suggestion I have heard is possible CPU failure. Have no idea what that would be like. Everything else was functioning until the screen froze and the keyboard/mouse went dead.
Any thoughts are much appreciated. I need to get this unit back online very soon. Thanks.

Let us know if you have good results after getting it fixed. I'll do the same since I told the shop to go ahead and fix it...
Facing the same conundrum myself, not wanting to have to unexpectedly shell out 3X more than the repair for the MacPro and then who knows how much to get the new MacPro up to my working specs when my current G5 is set up just how I like it and works well. I was faced with buying new video cards and adapters for my apple display to work with the MacPro etc etc...
I found a list of the flashing light codes on another forum for future reference...
1 Flash = No RAM (tested and verified)
2 Flash = Incompatible or Dead RAM (tested and verified)
3 Flash = Test Passed on Dead RAM (no)
4 Flash = No good Boot ROM (no)
5 Flash = Dead Processor (no)
I had 3 flashes followed by a pause... The shop could intermittently get my machine to boot just fine and pass the apple diagnostic tests, but then it would fail to re-boot at some point.
They said they tried swapping out ram chips only to get the same result, meaning that the ram chip bays on the board were shorting out in their opinion.
Really blows to have to pay almost what the same computer would cost to buy again on ebay, but since I'll never ebay another computer ever again (always have bad luck) my only other option is to fix it or buy a new machine and the cost was just at the threshold of where it becomes more sensable to buy a new machine. If the repair was over 1K I would have not even thought about fixing it.

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