Basically, I got my xbox360 modded last week, therefore it was obviously the latest hardware, I managed to play all of our old backed up games from my brother, including some new ones like Borderlands, and Batman. However, I cannot get Call of Duty: Modern Warfare 2 to work. I have tried downloading different files from different uploaders, I've tried using different discs including, Aone Premium, and Vertabim. But the same response is shown; when the disc is inserted, before it loads up you see on the dashboard "play DVD", and then the screen goes black, and the white background, xbox 360 logo shows up and thats it, however these backed up call of duty's work on my brother's xbox, and he has had his modified for about a year now, meaning he has older firmware. Please someone help me, thankyou. Matt.