Powermac G5 - worried about logic board

Hey everyone. I've been having a log of trouble with my RAM of late, and I'm beginning to worry that my logic board may be kaput, but I don't want to jump to conclusions. Sadly my applecare is expired so I can't call the experts.
Here's the exact rundown: I have a Powermac G5 dual processor 2.7 ghz. I had added 2 gigs of RAM when I first bought the computer a few years back. Made sure to check that the RAM was well certified and bought a warranty for it.
After working fine for 2 years, the other week my computer wouldn't boot past the white screen with the apple logo. When it was time to log in, the screen wouldn't come up. I was able to boot it in safe mode a couple of times, but eventually, it simply wouldn't do it's thing. Eventually I got a graphical error where the apple logo was.
I removed the extra RAM I had purchased, and, whammo, the computer booted normally again. PHEW.
Then I had a busy week and couldn't turn the computer back on. I wanted to test the 2 gigs of RAM I had removed in another slot, plus some RAM my roommate had acquired for me. So today I put her ram in the sucker, fired up the computer, and while it boot properly, it gave me a few graphical errors and after about 30 seconds froze. I had to manually power down the computer, and in booting it back up, I couldn't get the user login screen. Just a blank blue screen.
I removed my roommate's RAM and left it with just the original mac RAM in there, but it still wouldn't boot. I tried replacing that RAM with her RAM, and again, no boot. Etc.
There's nothing wrong with my power supply - the light comes on, the USB devices are powered, etc. But after the white screen with the apple logo, it goes black. The fan is not going wild (although a week ago, before I originally removed any RAM, the fan would go ballistic after about half a minute).
I find it hard to believe that ALL this RAM would have failed. Could this be a logic board problem?
Thanks for your advice...

Hi Yahweh_Sabaoth-
My guess is that the RAM supplied by the roommate wasn't even close to being compatible. That could have fried something.
Do you have the RAM installed correctly: Memory (DIMMs) Replacement Instructions
It is a leap of faith to presume nothing is wrong with the power supply. Said supply produces several different voltages, so the fact that the drives spin up does not necessarily indicate good health.
Now may be a good time for an SMU reset: How to reset the SMU on a Power Mac G5 (Late 2004) or Power Mac G5 (Late 2005
Make sure to disconnect everything except keyboard, monitor and mouse when troubleshooting.
Luck-
-DaddyPaycheck

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