DVD reading problem

I have a SONY CDRW/DVD CRX830E player in a DELL latitude laptop. It recently stopped playing DVDs but still plays CDs. When you put a DVD in, it spins for a second then stops. The media players say no disc is in the drive. If you put a audio or data CD in, it works fine. I tried to uninstall it, run a self test, everything says its working properly. Any suggestions? Thanks