DVD drive ejects all discs I insert

I have an XPS M1530 laptop with a TEAC DVD+-RW DVW28SLC ATA drive.

No matter what disc I insert, it tries to read it for about a minute, you can hear the disc spinning and then an attempt to read it, then it ejects the disc.

I have tried various blank cds, as well as burned cds, and retail cds that had previously worked fine.

I just began to notice this problem a few weeks ago when trying to install a program.  Otherwise, it worked for about 2 months when I first bought it (refurbished).

Any suggestions where to start?