I bought a couple of CDs recently. I tried to rip them with my old iMac (circa 2010). I'm running Sierra version 10.12.6. The computer would not recognize either one, and thought they were blank discs. In finder, they show as Untitled, with the black and yellow circle. They are commercial releases, so this isn't a CD+R. They both play fine in another device. The drive evidently still works, because I put a DVD in and it was fine. Apple's support forums are all down for maintenance now for some reason. Any ideas? All I want to do is rip these CDs into iTunes.