Hi, and thank you for asking your question.
What's the model of your Lenovo computer, please? Also, please do this now:
On your desktop screen, click on the folder (yellow) icon at the bottom taskbar; when a folder window comes up, RIGHT-CLICK on the CD/DVD drive listed on the left side (under My PC/Computer), and select "Eject". Are you able to eject the drive all right this way?
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Hmm, no issues. Now, please check carefully - do you see a tiny hole at the front of the CD/DVD drive itself? If so, please use a pin-shaped object and firmly insert it into the hole; let me know if this ejects the drive all right.
Keep me posted.