Updated Sierra and iMac Won't Boot

Discussion in 'macOS Sierra (10.12)' started by TheBruno, Apr 4, 2018.

  1. TheBruno macrumors member

    TheBruno

    Joined:
    Mar 29, 2018
    Location:
    Corvallis, OR, USA
    #1
    After installing a new update on my iMac today (Running Sierra), when it booted there was a cross symbol. Now it won't boot at all. What can I do to fix it?
     
  2. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #2
    This is why one keeps an external drive with a fully-bootable cloned backup of your (formerly working) OS around. For moments exactly like the one you're having now.

    Can you boot into safe mode? (reboot and hold down shift key continuously)
     
  3. TheBruno thread starter macrumors member

    TheBruno

    Joined:
    Mar 29, 2018
    Location:
    Corvallis, OR, USA
    #3
    Yeah, I entered into Recovery Mode, and I'm using a Time Machine recovery before the update was made.
     
  4. TonyK macrumors 6502a

    TonyK

    Joined:
    May 24, 2009
    #4
    Which update was it so we can keep an eye out and report with our experiences.
     
  5. TheBruno thread starter macrumors member

    TheBruno

    Joined:
    Mar 29, 2018
    Location:
    Corvallis, OR, USA
    #5
    After the Time Machine restore, everything is working. Strangely, it was a Safari 11.1 and iTunes 12.7.4 update. I'm reluctant to update it now.
     
  6. TonyK macrumors 6502a

    TonyK

    Joined:
    May 24, 2009
    #6
    My iTunes was updated a week ago to 12.7.4 and just this morning I updated Safari and security patches for Sierra. It rebooted just fine.
     
  7. TheBruno thread starter macrumors member

    TheBruno

    Joined:
    Mar 29, 2018
    Location:
    Corvallis, OR, USA
    #7
    It's my wife's computer, and her iMac is a 2013 model. It's possible the drive is starting to have trouble, or a file became corrupted after the update. Ever since the Time Machine restore, things are working just fine, and we've rebooted a few times. I'm not sure what the problem is, but since it's just Safari and iTunes, I've suggested she leave it be.

    My Late 2012 iMac just went down two weeks ago due to a faulty logic board, and I just spend $3k on a new iMac, so I'm pretty hesitant to drag hers into the Apple Store just yet.
     
  8. TonyK macrumors 6502a

    TonyK

    Joined:
    May 24, 2009
    #8
    If a restore resolved the problem, that doesn't sound like hardware. My first thought is a corrupted file during the update procedure.
     

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