Repairing a damaged G5 Power Mac

Just yesterday I attempted to boot up my Power Mac, but recieved no startup "chime" and no apple emblem on my monitor. In fact, the computer didn't seem to boot at all. The power supply seemed to be working fine; everything looked like it was running normally inside the machine. Firguring it might be an issue with the motherboard, I scouted on some forums and figured out that if you open the computer case and press onto the bottom bank of RAM near the heat sink, you can get the thing to boot. It worked perfectly, but I know this is merely a short-term solution to the larger problem. How would I go about repairing this? I figure it's either an issue with the ram itself or with the motherboard, but have no way of telling because I can't even get the heat sink out.
In short, can anyone tell me A) How to disassemble the Power Mac and
                                         B) how to repair the damage on either the RAM or the motherboard.

No, the RAM was not loose, otherwise the Mac would boot every time without problems. I believe there is damage to the mother board where the RAM is. When you apply pressure to the area these things tend to right themselves. Every time I want the machine to boot at all I am forced to push on the bottom RAM slot.

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