jackgerhart

Q: Monitor data "not supported" intermittently on Macbook Pro El Capitan 10.11.5

Loss of the external monitor display, with "not support" message on monitor, followed by black screen or fuzzy display. 

 

By running in safe mode or changing users I can partially and temporarily restore function.  With 5-10 second dark screens progressing to a fully dark screen, and occasional message: "not support" (its a Vizio monitor).  Also instances of fuzzy display, and intermittent - flickering display have occured.   

 

I went through the recommended processes in the apple monitor thread: Get help with video issues on external displays connected to your Mac - Apple Support,

  • Restart in safe mode to reset the display resolution to defaults seemed to work, but problem has returned.  System operates better in safe mode, and seems to reset monitor communication.
  • Logging out and back in resets to an occasional flickering as does changing over and back from a guest user I have set up.  However, with use, the I progressively lose the monitor and need to repeat.
  • Reseting Mac's NVRAM and SMC to reset the video ports to their defaults didn't resolve the lost monitor communication. 

 

The problem began shortly after updating Adobe flash player (22).  (Before this the system worked flawlessly).  I therefore tried deleting the 3 new files Adobe installed in macintosh HD / library / launch Daemons, hoping it was a software issue

 

When the monitor fails to work, testing monitor on our cable tv output shows monitor working well, and Running our TV off the mac also works. 

 

Seems like a software compatibility issue? 

 

  • System: MacBook Pro, i5
  • Graphics: NVIDIA GeForce GT 330M 256MB
  • External display E240AR 1920x1080 (VIzio)
  • OSX El Capitan 10.11.5
  • connection: via moshi HD cable

 

Obviously I am a real rookie at this - please any suggestions would be very much appreciated!

 

How can I track down this apparent software issue?  Looking at activity log - but unable to decipher a problem.

 

Thanks!!!

Posted on Jun 30, 2016 8:03 AM

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Q: Monitor data "not supported" intermittently on Macbook Pro El Capitan 10.11.5

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  • by jackgerhart,

    jackgerhart jackgerhart Jul 2, 2016 5:59 PM in response to jackgerhart
    Level 1 (4 points)
    Mac OS X
    Jul 2, 2016 5:59 PM in response to jackgerhart

    Safe mode no longer serves as a reset to the external monitor function. 

     

    The problem now persists in safe mode. 

    1) fuzzy screens

    2) Cutting out to a black screen - as if the monitor is attempting to require signal for up to 2 minutes

    3) "not supported" messages appear on the monitor

     

    Does anyone still read these posts?

  • by jackgerhart,

    jackgerhart jackgerhart Jul 2, 2016 9:08 PM in response to jackgerhart
    Level 1 (4 points)
    Mac OS X
    Jul 2, 2016 9:08 PM in response to jackgerhart

    Safe mode no longer serves to reset external monitor function.

     

    The problem now persists in safe mode.

    1) fuzzy screens

    2) Cutting out to a black screen - as if the monitor is attempting to require signal for up to 2 minutes

    3) "not supported" messages appear on the monitor

     

    I have repeated NVRAM and SRAM resets, ran in "safe mode" and ran as "Guest user"  without success

    Tried updating Adobe v22, but appeared to make the issue worse (monitor only flickers on momentarily now)

     

    Just removed adobe from system, downloading fresh version of El Cap.

     

    Tried turning off all processes not running when they monitor works - but problem persisted