So after beating the game I decided to get the expansion pack. After I downloaded it (at a friends house, and when I downloaded it and installed it I didn't have my MS game disc on me) and go back home, popped in my game disc, my TV shows me going from the XBM menu 1080p to 720p, but stays on a black screen and does nothing. Do I need to be connected to the interenet to activate the expansion or something? I don't want to delete my game file... since I JUST beat it all with gold medals.... any ideas?