My computer was finally working fine. Then I decided I was gonna put a disk drive in it. I put it in plugged it in and couldn't find the sata cable. So I took it out. I then took it out and put my computer door back on. Then this happened. The fans spin and the led's light up then stop and turn off. I've unplugged all my psu plugs and pluged them back into the motherboard. Still does the same thing... I now have no idea what it could be.