I just got a used pc in the mail that I bought on Ebay, but can't get it to turn on. Theres a power switch on the back, and after I flip that on, an orange light comes on inside the pc, but when I hit the power button on the front, all that happens is that the fan turns for a second then goes off. I think maybe something might have come disconnected in transit? If it's as simple as that, I'd be fine to take a look and fix it, but want to know what to look for specifically. If it's more likely that it got damaged in transit or was damaged before hand, I'd rather just send it back and get my refund. Any advice?