A couple of weeks ago, I went to turn on my computer, and, of course, it wouldn't power on. Well, not completely, anyway. When I pushed the power button, all the fans turn on (or try to) for about half a second, then stop for a couple seconds, then repeats the process until I disconnect the power. I tried replacing the power supply, but it didn't help. Also tried disconnecting reset switch, and powering on with only essentials connected, still nothing. POST testing is impossible since it doesn't get anywhere near that far along. Any suggestions as to what the problem is our what I can do to figure it out?