Try going into "Control Panel" and then "Device Manager" and search for hardware changes to the drive. If that gets no results, then I would try a different DVD and also try a CD. They are very different and one may still work when the other doesn't. Also, make sure you are trying this with a prerecorded DVD or CD and not a home created one. Those can have all kinds of issues. I would also check the disk in another device and make sure it works. You may want to look into cleaning the drive as well.
Should none of this work, then I would either contact the manufacturer (if under warranty) or try a local tech.