I am trying to figure out if I have a power supply problem or something else. I have a Gateway 504GR that does nothing when I push the button on the front. The power supply is a Bestec ATX-300-EB3. The green light on the back of the power supply is on and a small green light on the mother board is also on. I tried shorting the power switch pins on the board and nothing happened. When I connect the power cord to the power supply, something in the power supply starts to wine. I thought it was the fan, but the fan spins freely. When I unplug it, the wine stops. It sounds like something that was moving comes to a stop. I have no idea what would be moving besides the fan or what would make a noise like that. Is there a tutorial somewhere that tells how to test the power supply with a volt meter?