My Xbox 360 won't read Disks. Help!

I was playing Halo 3 last night and went to bed that night with my Xbox working just fine. I woke up this morning and put Halo 3 in and it says "Unrecognized Disk" everytime. I even put my other games/movies in and it said the same thing. My disks don't have any scratches. I bought a disk cleaner and it didn't work. Our local Gamestop doesn't fix or repair game consoles. Anyone know what could be wrong? Or have any recommendations as to where I should get it fixed?

Thanks.