Superdrive acting up

Could be the switch that is triggered when you insert the disk. To confirm you would have to disassemble the computer to take the drive out and check the switch operation with e.g. a multimeter. If faulty, it could just be dirt on the contacts or corrosion.

I read somewhere that a firmware update for the superdrive created enomolous errors. Is there a way to step back to the original and to block the update? What I get is both of my supperdrives act up in my mac pro. One superdrive refuses all burned disks and kiks em back out. The originals are fine but sometimes i get an error of no software to install like with my i life disk. Second try it installed fine. Same with Leopard install it took two pass to install. First time it ended with clean disk and restart try again. I did not clean anything just restarted and finished the install. Also the other drive I install a burned disk and it thinks I installed a new blank disk and it tells me to format it to burn data disk. Is this some kind of trick to destroy my burned disks?