Does it refuse to play both dvd's and cd's?
It could be a corrupted driver, where the driver rollback may work, as would deleting the drive from the hardware profile and reinstalling it.
You could also try cleaning the optics with a cd-cleaning kit.
If nothing works, it may be that the drive has died.
<b>You will die.
If you are lucky you may last ten decades.
If you are especially lucky you will be
remembered for another 5 decades.</b>