I recently bought the NBA2K11 game. I was able to play the game on my friend's xbox 360 S without any problems. When I try to play the game on my xbox 360 (orginal console), I get the open tray message. All of other games play just fine. I cleaned the disc, cleaned the cache, removed the harddrive and I still have the same problem. What do I need to do - replace the game or my system? Thanks!