I am trying to build a computer. I bought all new parts for this. After connecting everything, and I'm sure everything's connected right, the light on the motherboard comes on, but when I press the on/off switch on the front of the case, the fans try to turn on both the power supply and the motherboard. They only turn for about 2 seconds and that's it. Nothing else happens. I'm wondering if something was wrong with this board when I received it. Please help!