I got this gateway computer from someone its a p4 2.17 ghz 512 ram. He gave it to me because it would not turn on. So i took it home and open the case and i reset the power supply since there was a reset button and it turned on. So i changed the case because my case was way bigger with more fans and the video card would fit. When i changed the case my computer would not boot up, the led light on the mother board would just turn on. So i thought it was my video card. I disconnected everything from the mother board and left the video card on. To notice the when the computer was on the video cards fan would not turn on. Then i noticed there was a second connection on the motherboard ontop of the video card to plug in more power. so i pluged it in turned on my computer and the video cards fan turned on. but still no picture. after like 5 minutes i smells smoke and my power supply over heated and burned out. so i bought a new power supply and tryied again. This time i connected a POST card and noticed that the motherboard would not supply power to any cards or harddrives, just the led lighton the motherboard. The POST card showed FF on the the reading. I need help im baffled sorry for writing so much.