So I'm fixing an iMac G5 17" that won't light up or do anything and order a new power supply. I install it and everything seems fine. However, I notice something... There are scratch marks on the notch that are normal for a power supply that's been installed in an iMac. They get there because there's a screw at the bottom of the case that presses against that spot. I've exchanged a couple of emails with the company (one you've probably heard of). But, I thought I'd get your all's opinions. What do you think? New or used?