I came home from work today to find that my computer wasn't responding. It was running but there's no video output or response from the power button. I unplugged it an let it it for a few minutes. When i plug the power cable back in the video card fan runs, and the lights turn on but it shouldn't turn on unless i hit the power switch on the front of the computer. Not sure what part of my computer died but I get the impression something did. I tried swapping the video cards but to no avail.