Xbox 360 everything loads up fine, connection to live and

[mryenshi]

I am having the worst of luck with my Xbox 360. First of all when I turn on my Xbox 360 everything loads up fine, connection to live and everything else. Then when I want to play a game I go and put anXbox 360 game into the disc tray and, I get a 2-3 second sound like it is reading the disc, then it goes to "OPEN TRAY" on the Xbox dashboard. My Games are not dirty; they are in mint condition, with no scratches. Can somebody please tell me what is wrong with my Xbox 360?