I have a computer that I am trying to fix What I have done: reinstalled windows xp After doing this the problems still remained freezing and noises from the hard drive. When I returned a few days later with memtest x86 and a hard drive utility, the computer would not turn on. I took the panels off and took out the power supply; with an ohmmeter, I tested it. The power gets to the power supply, so I unplugged the 20 pin connector, jumped the third and forth terminal (ground and on) the fan turns on; I then proceeded to test the other terminals, all have power. I then traced the wire from the on/off button, disconnected the wire and jumped the pins, nothing happened. The green LED does not even turn on with power to the motherboard. Any ideas?