DVD burner drives have a lmited lifespan, either 2-5 years, or about 2,000 hours.
Environment plays a large part of it too: humidity, smokers.
As does the frequency and longevity of use sessions, which can cause it to overheat and kill component prematurely.
A DVD player/burner recorder dies in this order:
- Stops playing-reading-recording-burning DVD-RAM, DVD-RW, DVD+RW
- Stops playing-reading-recording-burning DVD-R, DVD+R
- Stops playing-reading DVD-ROM
If it doesn't do both #1 and #2, but still #3, it's probably toast. If it does nothing, it's toast.
This assumes the computer sees the drive, including burning/playing software.