I don't use my CD-ROM/DVD drive often, but every now and then I will want to burn a CD or watch a DVD. To my surprise, after no incident or software installation my combo drive doesn't work. When I insert a CD (blank or with data) or DVD the drive makes a noise similar to when you rest your top teeth on your bottom lip and blow air. After roughly 5-10 seconds of this the disk will eject. Any thoughts? How can a drive that is so rarely used simply experience a mechanical breakdown? The system profiler recognizes the drive as follows: MATSHITA CD-RW CW-8121: Firmware Revision: AA17 Interconnect: ATAPI Burn Support: Yes (Apple Shipped/Supported) Cache: 2048 KB Reads DVD: Yes CD-Write: -R, -RW Burn Underrun Protection CD: Yes Write Strategies: CD-TAO, CD-SAO Media: No The computer is a TiBook, 800 Mhz with 1 GB RAM running 10.4.5. I have not noticed any other peculiarities with the system but about a year ago I had to replace the hard drive because the S.M.A.R.T. status was failing.