My iMac just started with the same nonsense. Plays DVDs just fine; with CDs, clicks about 10 times, whirs, and spits out disk. I just got cable broadband and so was able to download updates and this started when I restarted after the downloads, which suggests a software problem, so I'm reluctant to get a new drive. Can I just attach an accessory external drive? I don't use CD drive much.