Just bought a modded xbox 360 Elite from Craigslist. Seller included a few burned game including: COD Black Ops, Gears of War 2, and Red Dead Redemption. Problem is, none of them will run! The xbox recognizes them as DVDs (the dashboard says "Play DVD"), then once I press it it'll load up the "XBOX 360" logo and just stall there. Am I missing something? I did format the hard drive before I tried running games (probably a bad idea, I know).