MacBook Pro and Projectors
I solved the problem of MacBook Pro not seeing the projector!!!
Just buy the cheapest VGA 15 pin cable from ¢99 Store and hook it up to your MacBook Pro via thunderbolt. And enjoy the show.
PS. Don't forget to click on the mirror in the Display system preferences.
MacBook Pro with Retina display, OS X El Capitan (10.11.6)