Why does my Mac Mini sound like it's ejecting a cd when there isn't one inside?
For a few weeks, the cd drive of my late 2009 Mac Mini has been "ejecting" a disk... the problem is that there's nothing in the disk drive.
iPad, iOS 7.1.2
What if you place on in the drive?
Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
It could be that optical drive died. The one in my late late 2009 Mini failed over two years ago. The symptom was that it would eject all disks. I used an external opticl drive and installed another HD in the place of the optical drive.