I'm not sure if the power supply is broken or not. I connected the A/C power cord to the power supply, plugged it in, and turned it on just to test it. Nothing happens - fan doesn't spin, LED doesn't turn on, no visible sign of anything. Is this normal? DOes it have to be connected to a motherboard to function in any way? Or is this one broken? I don't have the rest of the computer to test it with at the moment.