How to diagnose an internal optical drive that has quit working?The internal optical drive has quit accepting and mounting discs of all types - it will take one in, then just eject it...
Answer to "No startup chime/audio greyed out on late 2009 Mac mini?"If you have upgraded your OS to Lion or (especially) Mountain Lion, this can cause your problem. Look in Apples support section for details, but all I had to do was reinstall the new OS... Problem solved.