Hoorndol

Q: el capitan second screen

When starting up El Capitan on my new iMac, he doesn't recognize my 2nd screen (Eizo). After restart, there is no problem. This happens every morning when I start the computer. 

iMac, OS X El Capitan (10.11.3)

Posted on Feb 9, 2016 1:18 AM

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Q: el capitan second screen

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  • by sterling r,Helpful

    sterling r sterling r Feb 29, 2016 1:38 AM in response to Hoorndol
    Community Specialists
    Feb 29, 2016 1:38 AM in response to Hoorndol

    Hi there Hoorndol,

     

    It sounds like you have an external monitor connected that isn't being recognized when your computer wakes from sleep, but restarting the computer will make it work again. I would use the troubleshooting in the following article for external monitor issues, found here:

     

    Get help with video issues on external displays connected to your Mac

     

    This section in particular:

    ...restart your Mac in safe mode to reset the display resolution to defaults.

    ...reset your Mac's NVRAM and SMC to reset the video ports on your Mac to their defaults.

     

    Be sure to test out the monitor after each of these steps. Thank you for using Apple Support Communities, let us know how that goes if you please! 

  • by Hoorndol,

    Hoorndol Hoorndol Feb 29, 2016 1:44 AM in response to sterling r
    Level 1 (0 points)
    Feb 29, 2016 1:44 AM in response to sterling r

    Unfortunately, none of the suggested solutions worked. I also tried a new cable, Thunderbolt (mini displayport) to HDMI. Again: no improvement. I have to start the computer every morning twice or more to have finally a connection.

     

    Greetings,

     

     

    Ron

  • by Luis Sequeira1,

    Luis Sequeira1 Luis Sequeira1 Feb 29, 2016 4:35 AM in response to Hoorndol
    Level 6 (12,122 points)
    Mac OS X
    Feb 29, 2016 4:35 AM in response to Hoorndol

    Instead of starting, what about:

    1)  unplugging and replugging the cable

    or

    2) holding down the option key in System Preferences->Displays and pressing "Detect Displays"?

  • by Hoorndol,

    Hoorndol Hoorndol Mar 11, 2016 1:02 AM in response to Luis Sequeira1
    Level 1 (0 points)
    Mar 11, 2016 1:02 AM in response to Luis Sequeira1

    Sorry Luis, didn's notice your reply till this morning.

     

    No, I tried these two options also several times, with no succes.

     

    I think on this moment I have two options left:

    1. re-install El Capitan (would that help? Is it a MacOs failure?)

    2. Bring the Mac back to the dealer for repair (but I'm not so pleased bu the idea of missing this Mac for a few weeks...)