Hay, all of a sudden, my GTA San Andreas disk keeps freezing. I put my disk into my xbox, and it gets up to where it says "PRESS START". When I press start, it will start to load, and after about a minute come up with the dirty or damaged message, or, after i press start, it will load for a min or two, and then stop and do nothing, the dirty or damage message won't even pop up... PLZ HELP!!!!