Found an old antec psu in the garage & trying to see if it works. Plugged it into a wall socket & hit the switch & nothing happened. I thought the power cord was bad so I tried another one & got nothing again. I don't have another system to check it yet, but do I need to have the psu plugged into the wall & a mobo to see if it works? Is it some kind of loop? I know absolutely nothing about electrical.