CD not reading CDs

[Mooey]

My CD drive is not reading CDs. Burnable CDs sometimes work, and DVDs work as well, but the drive can't read purchased CDs.

Does anyone have any advice?

EDIT:

Fixed! I blew into the CD drive for 20 seconds.

 

[Tallest Skil]

Stop buying CDs. Buy from the iTunes Music Store!

Chat up a Genius or try some different discs.