JPRB_Mac_User

Q: iMac 27" 5K Late 2015 screen artefacts on shutdown

Bit of an odd one - upgraded to Mac OS Sierra, all working fine. When I shut the iMac down, the whole screen displays weird artefacts  - (graphics glitch?), then shuts down fine. So not causing a problem, per se, but wondered if anyone else has had this issue?

iMac (Retina 5K, 27-inch, Late 2015), macOS Sierra (10.12)

Posted on Sep 27, 2016 1:25 AM

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Q: iMac 27" 5K Late 2015 screen artefacts on shutdown

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  • by plxmas,

    plxmas plxmas Oct 1, 2016 3:56 AM in response to JPRB_Mac_User
    Level 1 (4 points)
    Desktops
    Oct 1, 2016 3:56 AM in response to JPRB_Mac_User

    I have the same problem.

    I wait for next update, than downgrade if isn't solved.

  • by Retro4K,

    Retro4K Retro4K Oct 6, 2016 11:53 PM in response to JPRB_Mac_User
    Level 1 (4 points)
    Desktops
    Oct 6, 2016 11:53 PM in response to JPRB_Mac_User

    I have the same iMac and the same problem after upgrading to Sierra. Green lines? (sometimes other colours) Its really quite jarring to see. Its almost as if the graphics card driver quits before the machine is finished shutting down.

     

    Reinstalling from Safeboot and resetting the PRAM etc doesn't resolve the issue and in the end I just gave up and restored using Time Machine back to El Capitan.