I just got a new power supply. After everything was plugged in correctly I turned it on. The computer turned on but none of the ports worked (meaning every plug in thing on the motherboard and case). When it is on, the light on the side of the case keeps blinking red. If I plug in the mouse, the light on the bottom of the mouse flashes for a fraction of a second. I looked on many forums and people described the same thing except the flashing light and the answer was that the motherboard was broken.