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I have a new 2012 MacBook Air (just a week old). Today I tried to connect to an external LCD projector, using a mini-DisplayPort-to-VGA adaptor, to project my slides.

Something went wrong and I was unable to project. My Mac detected the external projector, and I was able to mirror my main display, but nothing showed up on the LCD projector, despite trying two different mini-DisplayPort-to-VGA dongles. In the end, I was able to successfully project from a different, older Mac using one of those dongles, so I don't think the dongle is broken.

What should be the troubleshooting procedure, if this happens again? Does the new 2012 Air require any sort of different procedure or equipment for mirroring your display onto an external projector?

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3 Answers 3

Pressing CommandF3 should cause the display to show.

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The recommendation I received was to open a call from "bugreport.apple.com" and hope that this is fixed in future updates of the operating system.

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Feel free to link to the bug report that you filed and flesh out how you considered this to be a bug if you intend that to stand alone as an answer. Thanks for the tip - It's almost more of a comment than an answer at this point. –  bmike Oct 24 '12 at 13:23

In a pinch, this usually works:

  1. Connect your computer to the projector and turn the projector on.
  2. Restart your Mac.
  3. It should now work.
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Yes restarting with everything plugged in works BUT that's not feasible for a teacher on the go. Any other fixes? –  user28130 Aug 27 '12 at 18:57
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You should never have to restart a computer to get this to work. (Sometimes it's a quick fix, but that's crazy annoying to have to do.) –  CajunLuke Aug 27 '12 at 19:28
    
Rebooting may work, but as others say, it's a sucky workaround that pretty much kills the use case of projecting from your MBA. After doing a bit more background research, it appears some sort of bug was introduced into the Apple drivers in one of the last few releases. It appears that the bug has been present for a few months with no resolution yet. I guess we wait for Apple to fix it. –  D.W. Oct 16 '12 at 21:40

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