Sony DRU-510a trouble

I have been burning with this drive since 2003 with no problems. Just last week I sat down to burn a dvd and inserted the blank media and the burner would not recognize it. The burner sits there with the light going acting like it is trying to read the disk, but it won't. If you insert a cd-r data disk it would read it. I understand that there are seperate lasers for the cd and dvd aspects? Could a drive just quit like this? I took it out and used a microfiber cloth to clean the lasers, but that did not work. I have also uninstalled it, updated firmware and tried restoreing system to an earlier date but it still won't work. My computer tells me no changes have been made to the system to warrant the system restore. Is the drive just shot?? Thanks for the help