Ditto. iMac G4 17", Pioneer DVD-RW DVR-105. Mac OS X 10.4.6
My Applecare expires in 29 days.
My son has been using this computer and reported it would only recognize commercial DVDs. He brought it back to me and we eventually went 1-800-SOS-APPL. A Very nice man, Shaun, walked us through the following.
Does it refuse to recognize different brands of DVD-R? Yes.
Have you tried different burn programs? Yes--Toast and Apple Finder
Reset PRAM, NVRAM. Still doesn't work.
He authorized it to go in for replacement. Took it to Brown Computer Solutions in Brattleboro, VT. The next day they said they booted the computer from an external drive and the DVD burner worked. Hmmmmm. They said software problem. I asked what would they do to fix it--at a cost naturally--and they said they would first do an archive and install of OS. If that didn't work, they would wipe the drive and install from scratch. I told them I can do that and got it back.
Well, first I did the archive and install. Spins spins spins, spits out blanks. Yesterday I bit the bullet and wiped it and installed all the OS and updates clean. Doesn't recognize even commercial dvds now. Hmmmm.
I reset PRAM and NVRAM. Nope.
I rebooted from an external hard drive and it doesn't mount or burn from there either.
So I said back to 1-800-SOS-APPL, but they aren't open on weekends????? since when ???
I suspect my superdrive was in the intermittent throes of death when Brown Computer Solutions got it to burn from an external drive.
With 29 days left on Applecare plan, I intend to have Apple replace the superdrive.