HT201181: Mac notebooks: Key placement and functions
Learn about Mac notebooks: Key placement and functions
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Helpful answers
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Apr 6, 2015 4:04 PM in response to john davidfromgold coastby jeremy_v,Hi John,
Thanks for participating in the Apple Support Communities.
It sounds like you want to use a projector as an external display, but it's not recognizing the Mac.
Depending on which version of OS X you're using, you may need to change the Display settings under System Preferences on your Mac to use the projector.
If you're using OS X Mountain Lion or earlier, see this article for help:
OS X: How to use multiple displays with your Mac in Mountain Lion and earlier - Apple Support
If you're using OS X Mavericks or Yosemite, see the "Video Mirroring" section of this article:
OS X: Using multiple displays in Mavericks - Apple Support
If the projector doesn't show up as an external display in System Preferences, it may not be compatible as mentioned in If your third-party display or projector doesn't work in OS X.
Sincerely,
Jeremy
