XBOX 360 WONT READ MY DISC!!?

This happened in the past but it fixed itself before and than I didn't see it again until just a week ago. Now my Xbox won't read the disc at all! I put in any game and it says "reading disc" waits a few seconds and than says "open tray" ive tried dusters and they didnt fix the problem. all my games are in top condition non have any scratches and I purchased a new game recently and it won't run as well! I desperately need help! (it does the same thing with all my games)