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Wait a few seconds then take your battery out of the Mac then re-insert the battery. Shut down your Mac and unplug the MagSafe power adaptor from your Mac and from the wall socket. Upon start-up this time your CD should eject itself. Once your Mac is running again you’ll turn around and shut it down this time -repetitive I know. Now restart your Mac and wait for everything to load up. Next put your Mac to sleep then wake it back up. Make sure all applications are shut off and if any are being stubborn just press Command + Option + Escape to force quit.
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This method is for when you are running a diagnostics so when the machine sees that the currently mounted CD/DVD is not appropriate for such an action it will eject it. Hold down the C-key upon restart and your Mac will try to run the CD that is in the optical drive.
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Lightroom - How To Delete Multiple Photos
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