Everything, campaigns, spartan ops and war games. All it does is stay at the loading screen then it switches to a black screen for about a second or two before kicking me straight back to the main menu. No error messages or anything. I havent been able to play a single bit of Halo for the past week when this problem just decided to come out of nowhere. I even tried installing the game to the HDD and it still doesnt work. Just gets stuck at the loading screen forever (and I can still hear people using their microphones) then a boot straight back to the title screen.