Xbox360 problems HELP

I was playing my xbnox 360 this morning and it worked great, I get home from work and none of games will read,

Halo 3,Assassin's Creed,COD4, none of them work. HELP PLEASE

they sometimes say play DVD, and sometimes it just says UNREADABLE please help me

Send it back. I live in the UK and my friend sent his back and it only took 10 days, including waiting for the box.

You could try blowing into the disk drive coz the lens could be dirty.