My macbook pro doesn't communicate with video projectors anymore

Since a while, I cannot use my macbook for video presentations anymore.
The video beamer doesn't "see" my laptop, and in the display screen, no other screens are indicated.
Anybody out there who can help?

Make sure the discs are free of finger prints. The optical drive cannot read a disc with smudges and dust.
Check Finder > Preferences > General
Make sure:  CDs, DVDs, and iPods, is selected.

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