Mac Pro 2,1 Spontaneous Restart with No Boot - Power Supply PSU Problem?

One day I was working away on my Mac Pro 2,1 Quad Core 3.0 (2007) with 8 gb ram running Lion and it just shut itself off like someone pulled the power cord (but no one did of course). Then it attempted to restart, but wouldn't boot. Basically I haven't been able to use it since as I can't get the computer to stay on for any length of time.
I'm thinking its either the power supply or the, oh no, logic board.
Symptoms have been like this so far:
Initially I would get a chime and a boot start but then I would find the computer would shut itself off somewhere in the process and try to restart. Usually the next time I would get no chime and a horrible repeated clicking of my optical drive with a rythmic fan whirring up and down on the original ATI x1900 xt graphics card. I would have to manually power off with the power button to make it stop. Sometimes it would try to restart again anyway. The only way I could get a chime again was to unplug and wait (longer the better). But even if i got a chime and a start of a boot, invariably the computer would turn off again.
I couldn't boot from another source, I couldn't run apple hardware test, I couldn't run diagnostic,... it just wouldn't stay on to do it.
I hauled my mac pro (out of warranty) to the apple store genius bar and the problem presented itself, continuously. The gent was able to get fsck to work long enough to determine my hard drive was ok and said it was one of three things - the power supply, the graphics card, or the logic board. He said because the comp powered on and then shut off, and because there was intermittent chiming, he didn't think it was the power supply. He thought it was the graphics card and said I could leave my Mac for 10 days and they could take a looksy, or I could just install a new graphics card on my own.
I chose the latter, bought a ATI Radeon 5770 from the apple online store for $275 and installed it.
Problem persists.Exactly the same as before. Got initial chime, then next time no chime, optical drives clicking and graphics card fan whirring up and down rhythmically.
I had a touch of time to disconnect everything and I get a chime consistently now when I have my boot drive, graphics card, 4 gb ram, and monitor attached. (As well as wireless mouse, keyboard, trackpad). I even got to logon once only to have a prompt shut off and restart attempt. also I verified it was at least one optical drive clicking (when I removed them both) during these boot attempts.
The improvement in chiming seemed to be when I unseated one ram riser ( I have to with 2 x 2g ram modules each).
I also checked the diagnostic leds on the logic board and all was as it should be... says I got trickle power and rail power etc.
Is there anything else I can do to determine what's wrong? What do you guys think is wrong? Could it be bad RAM? Power Supply? Logic Board?
All your help is massively appreciated in advance!

Well I ran as many tests as I could with no definitive results to the point I would have to start buying replacement parts and testing that way. I opted to take it back to the apple store and they said it's (dun dun dun dunnnnn) the logic board.

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