I have a second old computer I use as the dedicated media computer hooked up to my big screen. I noticed that a couple of times I would push the power button and it would not go on even though I saw the power light on the card reader go on. I unplugged it from the surge protector waited a few moments and plugged it back in, hit the switch and it powered up just fine. I have had to do this several times and now it no longer powers up at all (except for the power light on the card reader).
I put the computer on my bench, took off the side, plugged it in and I hear a low audible, high pitched whine coming from the power supply, but nothing is moving inside the power supply. I push the power button and the fans spin for 1 or 2 seconds and die. I think the power supply is shot and I need a new one, but I wanted to confer with some experts to see if my diagnosis is correct before I order a new one. The present power supply is a 500 watt Antec Smart Power.