Hello, I was removing a fan from my case because it had a high pitched sound when you turn it up. I took it out and tested it to make sure it was the fan and not something else. It came with a molex connector and I wanted to try it, so while the computer was turned on i unplugged one of the male molex connectors that gives power to my graphics card and used it to test the fan. When I found out it was the fan, I connected the molex connector(1 of 2 that give my video card power) back into the video card and the whole system shut off. Now when I turn it on it only stays on for about 1/2 second. All of my fans that i have connected turn on exept for my cpu fan. I feel really shitty because I just had to get a new mother board cpu and ram becausee I dropped a magnetic screw driver on my last motherboard.