360 does not read discs.
My 360 can't read disc, but I can access the dashboard without any problem.
I tried the following:
1. taking the 360 apart and cleaning the lens with rubbing alcohol and a Q-tip.
2. Using compressed air to clear any dust.
3. replacing the disk-drive itself, but still having it not read any discs.
On occasion, some disc will be be to play but eventually I'll get a disc-read error.