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I have a mac mini as listed A1103 it belongs to my girl theres a cd inside the unit and it doesnt come out and seems to be causing some kind of error because the unit doesnt post. Is the cd inside causing the problem, in any case this is the issue how do i take the cd out? Or do i have to replace the optical drive? Thanks in advance.

Restart holding down the mouse button and it should eject. Also try: Open the Terminal in the /Applications/Utilities/ folder and run: drutil eject

If your CD is stuck and none of the other methods work, you might eventually try pulling out your optical drive and doing this: Optical Drive Disc Removal Technique

You could also try the double sticky tape trick, There’s many reasons to fail POST however AFAIK a stuck CD is not one of them.