Wedge,
nForce is very picky about RAM. You should always run Matched Sticks and they need to be nForce Approved.
Only the TwinMOS RAM with the WinBond Chips is nForce Approved. Lets try one stick of RAM at a time and see if we can at least get you to the BIOS.
As for the Power Supply, I was looking for the amps on the 3.3v, 5v, and 12v RAILs and the Max Combined Wattage of the 3.3v + 5v RAILs. There should be a sticker on the Power Supply that looks like:
Take Care,
Richard