Try repairing permissions
This may sound strange:
I dicked around quite a bit with my new iBook when I got it. What happened: would not recognize CD-RW or CD-R's, clicking on "more info" in About This Mac Window" did nothing, DVD player would not launch whwn DVD inserted. I repaired permissions from the Jaguar CD and it fixed it. On my PowerBook, I was again messing with stuff I should have left alone: same symptoms. This time, repairing permissions did nothing: I had to re-install the OS. Luckily, I back-up apps, documents and prefs every week. because I know myself. Good Luck!