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Mac can't detect external display after update.

7786 Views 5 Replies Latest reply: Mar 6, 2014 7:10 AM by Long Lane RSS
donpd Level 1 Level 1 (0 points)
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Apr 21, 2013 3:20 AM

I recently updated my MBA, i forgot what update it was but it had safari 6.0.4 in it and a few somewhat minor updates but after the update my Mac can no longer detect external displays. I tried restarting, removing, and turning off the TV but it still wont work. Before, I just had to connect the cable and the mac instantly recognizes the display and it quickly switches to that but now it wont work. Is this a software problem?

MacBook Air, OS X Mountain Lion (10.8.3)
  • braytonscott Level 1 Level 1 (0 points)
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    Oct 3, 2013 7:22 AM (in response to donpd)

    I have tried this process twice and it still will not detect my external monitor. I am lost for ideas and have tried every thread available. Sending mine in to the Apple store today to fix this problem I use my external monitor for coding and its hard on the eye sight when using this one on the Macbook Pro.

  • sunbeam49 Level 1 Level 1 (0 points)
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    Oct 19, 2013 7:25 AM (in response to braytonscott)


  • Long Lane Level 1 Level 1 (70 points)
    Currently Being Moderated
    Mar 6, 2014 7:10 AM (in response to donpd)

    For what it's worth: I had similar problems: I have a Mac Pro (2,1) with a 5770 graphics card. The card supports three displays (one DVI, two DP ports). I have two 30" cinema HD displays connected to it and one AOC 24" FullHD monitor via DP.


    Quite frequently, the AOC would not be recognised when waking from sleep and I had to force the computer to detect it (unplugging cables, etc.). Given that the Mac Pro is about 7 or 8 years old, I changed the 3V Lithium backup battery (Panasonic CR 2032). That changed it completely and I haven't had any more problems.


    Give that a try.


    My $0.02




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