I am having some trouble when I shutdown my computer. Everything shuts down but when it is off fans are still running and power supply is still on. I think this is happening because the motherboard doesn't send signal to shut down the power supply. It really doesn't effect the way the computer runs when it is on, just doesn't totally turn off. Anyone have an idea of what might be causing this? Possibly a cable not plugged in. I really haven't taken a good look at that but I don't think it is a loose cable.