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Main monitor flashes blue over and over with 2nd monitor connected

897 Views 18 Replies Latest reply: Aug 15, 2013 11:28 PM by mrbofus RSS
  • ileob Calculating status...

    Hi William,

    I am encountering a perhaps related problem with my Thunderbolt monitor on a 13" mid-2011 MacBook Air. Since having installed the security update 2013-003, both keyboard and ethernet which are both connected to the screen, sometimes won't work. The screen is always there, however. This only happens when I arrive at the office with my laptop and connect the screen. I also haven't yet found a consistent solution (it has happened only twice so far, but never before the update), but my current "method" is to restart the Mac without the monitor attached and then connect later. Of course that won't help in your case...

    I will also file a bug report with Apple, hoping that it gets their attention.



  • mrbofus Level 1 Level 1 (5 points)

    In my case, it's not an issue of the iMac's screen flashing blue, the iMac's screen just simply randomly turns off.  I posted an update in the thread I started [ ] where the issue seems to go away if I don't let my computer go to sleep.  If I don't let the iMac go to sleep, then the screen turns off and on as it should. 

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