DVD RW drive not detectind DVDs
 

This thing started about a month ago. I tried to burn a dvd but nero wasnt able to and after that my drive wasnt able to detect any dvds. i can still run cds though. i tried system restore but to no avail. config- HP compaq presario v6715EE C2D T7700 2.40ghz, 2048 mb ram, TSST corp dvd rw...