I just purchased an ASUS Vintage-AH1, AMD 3000+ Socket 939 and 2 256MB sticks of DDR400. When I plug the power supply into the wall, the little green light on the back of the power supply lights up, I also get a green power light on the motherboard. As soon as I press the power button on the case, the light on the power supply turns off and the machine won't power on. I've triple checked all of the jumpers and power cables and everything is plugged in correctly.
Does this sound like a motherboard problem or a power supply problem?
I don't have a spare power supply to test it with. I'm tired, angry, and looking for some input.