I've answered this in your other thread but as I now know it's a Dell, go to your country's Dell website and input the Service Tag which is printed somewhere on the case of the computer, into the box at the Support>Driver Download part of the site. That should lead you to the drivers you need.
* Try ejecting using windows Explorer (My Computer Right Click on Optical Drive Icon and Select Eject).
* Try to eject in BIOS.
* Try ejecting using the emergency eject switch (insert a straightened paper clip into the emergency eject hole, next to the eject button to lose the tension of the spring).
* Update the BIOS and Dell Quickset.
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