I just put a new PC together this evening. I have a corsair CX650M PSU. As soon as i plugged it into the wall and turn the power on i got a big spark out of the back of the unit and the cord appeared to have some grey on it. is this a possible just bad power supply or am i completely SOL? Is there anything i can do to test anything. I would hate to have to pull my PSU from my current PC and blow that up to.