I have two identical motherboards, two 512Mb ram, one 2.8ghz cpu, and two different power supplies(420watt and 520watt). I've traded out all extra hardware in all combinations of the above and the system can get full power up to ram testing and it suddenly powers off. If I try again, the time it is running is decreased to where I don't even get enough time for display, then if I try again the system doesn't even start until I unplug it and plug it back in and wait a while. I realize this is a power issue, but both power supplies do the same thing with both motherboards. I have tried connecting straight to a wall outlet and through a surge protector. Can anyone give me a solution, it would be deeply appreciated.