Dual 2,5GHz G5 with startup problems

Hi,
I have a Dual 2,5GHz (June 2004 model) G5 with the following problem:
When I try to turn it on, the screen sometimes stays dark. This is often the case the first time in the morning. Occasionally when this happens the front power LED is off. I have to power it off and try again.
After usually 2-3 tries I get it to boot, the LED is on, the system boots but freezes during boot (sometimes at the grey Apple logo) or it boots completely and freezes after a while of working with it.
I reseated the video card and also checked battery voltage (it's 3.6V as it should be) and even put in a new one just to be sure, but that didn't change anything. I also tried the PMU reset from time to time.
I suspected bad RAM and since I have 2 pairs of the original 2x256MB and 1 pair of newer 512MB modules I started testing RAM by using the memtest in single user mode. Now comes the weird thing:
Sometimes the G5 freezes during memtest, but most of the time it runs and passes all tests with OK. I always put in 1 pair of RAMs at a time (the first 2x256, then the other 2x256, then the 2x512) to rule out bad RAM. Since memtest never displayed an error as long as the machine did not freeze I think I ruled out bad RAM. They also seem to work fine in another G5 (same model).
Then I thought maybe some RAM slots on the logic board are defective and repeated the above tests with other slot pairs, but the outcome is still the same.
I am not quite sure, but I think the logic board went bad. Do you have any additional suggestions? Is it also possible that the CPUs are the culprit or can that be ruled out?
Thanks
Björn
PS: I forgot to mention that sometimes the startup chime does not play and (very rarely) it plays but gets cut off at the end.

Hi DaddyPaycheck,
I know that.
Sorry, but what I meant was that this problem has nothing to do with the hard disk not working or the OS on it being corrupted. The G5 doesn't even get to the point where booting comes into play. It hangs most of the time way before that. I am pretty sure that it's the logic board, but it could also be defective CPUs and I was hoping for someone with a similar problem to narrow it down.
Björn
PS: Can it still be the power supply even though it's always powering on and turning on the fans? I never had the case that the G5 stayed completely "dead" which usually means the PS is defective.

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