I have an old computer that I built that was working GREAT a COUPLE weeks ago. I recently unplugged it for a couple of weeks as we are having our house REMODELED and now it will not boot at all - no LED lights, no fans spinning, etc. The power supply is a 400 watt version that is only 2 months old and was working great. I even went and bought another 400 watt power supply and still nothing happens. I have tried several different power CORDS, different surge protectors, and plugged it in directly to the wall, with no difference. I have the power supply BUTTON in the back in the on position. I see the green light on the motherboard indicating that it is getting power. I have taken the RAM out and reseted the ram, tried each stick by themselves.

Thanks for the help.Was it only unplugged, or unplugged AND moved? I would start by reseating everything and checking all plugs and cables.And check where the actual power button is plugged into the motherboard, as well as the button itself. I've had trouble with that stopping working a few times. You can manually start it by completing the circuit where the button plugs in on the motherboard (i.e. placing a small wire from one pin to the other for a short second).