My problem is similar to yours, 'Skoomaholics Anonymous', but to a greater extent. With the disc in, the Xbox says 'Open Tray'. After opening and closing the tray roughly 10 to 20 times, it'll say 'Play DVD'. A few more times and it will say 'Play Game'. Then a few more and it will say 'Play [Name of Game]'.
And even then, it might not work. It may start to load, before getting the 'Disc cannot be read' error, or go into the game with a glitch (The main menu in Black Ops has missing walls, for example).
I must say, everyone here is
very, very helpful. I'll try to use these tips again Cazadors next time I play