anzahero
Level 1 (0 points)

Q: Horizontal grey lines across entire display after VGA external screen disconnect

Hi all,

I have been using an external screen with my Macbook pro from mid 2014, retina display, Yosemite. After disconnecting the power on the external screen the screen on my Macbook started flickering, with broad horizontal lines moving at the low end of the screen. Now it stabilized, but the retina display still shows tight grey horizontal lines across the whole display, regardless of the app I'm using. When connecting to the external screen that screen looks fine, so it seems something went wrong with the retina display after the disconnecting from the external screen. Is there a fix for this, or do I need to contact support? The Macbook is only a year old, so I guess I'm within warranty.

 

Anna Sara

MacBook Pro (Retina, 13-inch, Mid 2014), OS X Yosemite (10.10.5)

Posted on Feb 29, 2016 1:55 PM

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anzahero

Q: Horizontal grey lines across entire display after VGA external screen disconnect

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  • by MrHoffman,

    MrHoffman MrHoffman Feb 29, 2016 2:11 PM in response to anzahero
    Level 6 (15,627 points)
    Mac OS X
    Feb 29, 2016 2:11 PM in response to anzahero

    Seems like your graphics controller or related hardware might be failing.   Reboot to see if this clears, and perform the usual NVRAM and SMC resets — which probably won't help, but are otherwise harmless — check your warranty, and then make a complete external backup (or two), and make a trip into the local Apple repair shop or Apple Store for a look.