ASUS P8H61 MX USB3 Motherboard

Hey guys, I have a dell 9020 i got 2nd hand that is not starting up. It came to me like this: Dell Optiplex 9020 Tower i5-4590 3.3ghz Quad-Core 4gb DDR3 (1stick) no hard drive DVDRW. I purchased it as part of a bulk lot and it said "no power" so i had premptively purchased a replacement Power...