This happened to my friend first somehow all his live games stopped working, so he blew his xbox with a firework. Then oneday i went to his house with my xbox to play halo 2 (since his didnt work) he still had his halo 2 so we put that in my xbox and it wouldnt load (same problem on his xbox), so i got my halo 2 and it worked fine. The next day at my house i felt like playin some xbl on halo 2, but when ever i put in my halo 2 the screen turned black then it said "you need to connect the DVD Playback Kit reciever to a controller port to watch movies. Remove disk to continue." So i got my playback kit and put it in the port and it went to the little video that comes up when u put a xbox game in a dvd player and said "This is an Xbox game disk. Please put it in your Xbox to start playing." What is the problem??
NOTE: It started doing that after my friend put his halo 2 disk in my Xbox, and also i tried all my other games live and regular ones and they worked fine.