I bought an xbox 360 off ebay and the seller said that it had a laser problem so i bought it, when i received the xbox it read CD's but not dvds or games so i purchased a new laser, i had just got done installing the new laser and i tested it while the xbox was apart, the game played fine but after i put the xbox back together it gets This disc is unreadable every time i try to launch the game, i have tried taking it apart to figure out what the issue is but have had to success, also i should mention that it plays DVD's and CD's.