I just want to see if my PSU is working. I just ordered a Corsair RM 650. I plugged in some fans, because I'm not ready to plug in anything else yet, but nothing came on. Is there something I'm not aware of, like it needs a little more of a load for it to work, or did I possibly get a bum unit. It was refurbished. Are there a few tricks I can use to tell if it's working. I've seen a paperclip method, but all the cords are black. Anyone have any suggestions? Thank you.