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Screen Flicker with External Monitor

71523 Views 188 Replies Latest reply: Apr 14, 2014 11:01 AM by mloseke RSS Branched to a new discussion.
  • ozdeveloper Calculating status...
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    Apr 18, 2013 2:59 AM (in response to Wycliffe)

    I had this problem a few months ago.  I bought a new display port to hdmi adaptor and it seemed to be fixed.  Last weekend I moved my desk and cleaned my office and bam the issue came back again, sometimes. 

     

    I fiddled with cables heaps, I read heaps and I googled heaps more.  Finally somebody on hear said they moved their iphone away from the monitor.  Well as I turns out I had decided to use my keyboard usb ports after moving my desk to charge and sync my iphone.  So I unplugged it and moved it away and so far so good no flicker.

     

    So hopefully this helps.  What is also different is they way I have my logitec 2.1 speakers setup so perhaps a combination of the 2 was causing the issue.  Will have to wait and see fingers crossed.  Makes you wonder though what apple do differently to PC because nobody reports this as being an issue with PC's and I am sure that plenty of them have their phones near their monitors. 

  • gekkonaut Level 1 Level 1 (0 points)
    Currently Being Moderated
    Apr 18, 2013 3:06 AM (in response to ozdeveloper)

    Are you having this issue on a 24" cinema display? If so there is a firmware update for the display (earlier in this thread or another -- i can find it if you can't) which I'm 99% sure will fix the problem (not an update which comes through software update).

     

    If it's a 27", then it's probably some other issue.

     

    ozdeveloper wrote:

     

    I had this problem a few months ago.  I bought a new display port to hdmi adaptor and it seemed to be fixed.  Last weekend I moved my desk and cleaned my office and bam the issue came back again, sometimes. 

     

  • Ryan Johnson Calculating status...
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    May 24, 2013 2:19 PM (in response to Wycliffe)

    I am still having this problem.

    I connect my late 2012 15" MBPro with Retina display to a mid 2011 21" iMac for use as an external display via thunderbolt.  Both devices are completely up to date on software and firmware.

     

    Randomly the iMac screen will go black for a brief second and then come back on.

    This happens anywhere between 1-20 times in an 8 hour day.

     

    It sounds like Apple is aware but most people seem to be reporting the issue with connections to an external monitor while I see it connected to another computer (although it's being used soley as an monitor).

     

    Please fix this porblem Apple.

  • Shayna23 Calculating status...
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    Jul 26, 2013 8:02 PM (in response to Wycliffe)

    MY issue is that ANY cable inserted into the "miniDisplayPort" in the back of my iMac causes the screen to do one very brief horizontal flicker (I call it a "blip") about 2 or 3 times an hour.

     

    I have used SEVERAL different cables in the mini DisplayPort to connect various monitors; after trying different cables, different secondary monitors, etc., I have determined that ANYTHING plugged into the back of my iMac causes this intermittant "blip."

     

    In a nutshell, I recently did a little "test" as follows: I purchased a simple small miniDisplayPort extension cable. Without attaching any monitors or anything, I just stuck this cable into the back of my iMac and let the 12inch cable hang there. SAME THING: the intermittant "blip" happens 2 or 3 times an hour.

     

    Any ideas?

  • christian_roessner Calculating status...
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    Oct 2, 2013 3:33 AM (in response to Shayna23)

    Hi, I have the same issue on a Mid 2012 MBP and an external Apple Cinema Display 27". What I found out was that it seems to be the connector itself. If I open a black terminal, I can see white pixels flickering, too. If I move the connector a little bit left or right or so, it stops flickering. After that the screen is completely stable. So it seems the connector is somewhat sensitive and you need to find the "right" position. That workaround is working for me.

  • theooriginal Level 1 Level 1 (0 points)
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    Nov 12, 2013 11:08 PM (in response to David Stelly)

    I do notice that if I switch to a lower resolution the flicker/static is not as severe

  • TTabby Calculating status...
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    Dec 17, 2013 3:57 PM (in response to ozdeveloper)

    @ ozdeveloper… I'm with you on this one.

    I was going nuts for days/weeks !!! with intermittent flickering on a 2nd monitor connected to my iMac 21.5".

    Buying new cables, shielded power strips, etc, etc…

     

    One day, it suddenly stopped flickering at all.

    Then I realized that I had left my iPhone4 out in the kitchen.

    I usually have/had it propped up in front of me on the iMac.

     

    Ever since I realized this, no more flicker, nada, never !!!

  • andi_h_mac Calculating status...
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    Feb 1, 2014 2:13 PM (in response to Wycliffe)

    Old thread, but this issue drove me crazy for a few weeks. I had a 24" HP monitor (1920x1200) connected to a 2013 MacBook Air via Thunderbolt/MDP to VGA adapter. First, I noticed that the flickering was not there at lower resolutions. I went to an Apple Store later and got the Thunderbolt/MDP to DVI adapter which completely fixed this issue for me! Steady image, no flickering at all! Hope I could help!

  • mloseke Calculating status...
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    Apr 14, 2014 11:01 AM (in response to Graeme Watt)

    Nice Graeme, that seems to be what was happening in my case as well.

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