Problems w/Lite-on DVDRW SOHW-812S

MY DVD drive does not drive it just say cd drive, In the past we have watched movies and such with this drive, seems that we have just lost the DVD side of it, If I put in a cd (music) and it prompts and playes. Nero see the DVD drive, but If I just put in a DVD movie in the drive, it never see it through any movie viewing programs, or in my computer (D drive ect. I hope I’m in the right area for this question, I am a newbie!