Latest update just killed my iMac

Discussion in 'macOS High Sierra (10.13)' started by neale68, Feb 28, 2018.

  1. neale68 macrumors newbie

    Feb 28, 2018
    Yesterday I booted my iMac for the first time in about four weeks (A1224) and it told me an update was needed and to restart it to finish. I restated and it hasn't booted since. The update was something to do with High Sierra, but I didn't really tale much notice.

    It starts the boot up procedure. It bongs, I get the apple in the middle of the screen and the progress bar gets to about half way, then the screen goes off, and occasionally flashes on. When it flashes, i can briefly see the progress bar and it doesn't move. It was left on all day yesterday like this, flashing every 5 to 10 seconds, with no progress.

    I have tried booting up safe mode and it does exactly the same thing except the flashing screen is opposite. ie it flashes off briefly every 5 to 10 seconds but is mainly on.

    I have tried the reset NVRAM startup and also the reset SMC startup. neither made any difference at all.

    Is there anything I can do to get the machine back to how it was before it tried to install this update?

    Last time I used it I did take a Time Machine backup, so I have this.

    I do not have any original OS stuff as I bought it 'refurbished' with the OS already installed.

    Can anyone help, i'm getting desperate.

  2. TiggrToo, Feb 28, 2018
    Last edited: Feb 28, 2018

    TiggrToo macrumors 6502a


    Aug 24, 2017
    Out there...way out there
    Are you able to get into the Recovery Mode? If so, and you have that Time Machine backup, follow Apple's instructions here: About macOS Recovery

    This all said, the visualization you paint would have me wondering if it's hardware related that just hit at the same time as the reboot.

    There's two things at play, remember - the update AND the reboot - doesn't necessarily mean the update did the damage, it could have been the reboot...
  3. neale68 thread starter macrumors newbie

    Feb 28, 2018
    Thanks for a quick reply. I'll have a go at the recovery mode option. Didn't realize that was a thing! Fingers crossed I get somewhere.
  4. neale68 thread starter macrumors newbie

    Feb 28, 2018
    Thank you TiggrToo. I am up and running again after a restore from Time Machine. So happy I did teh back up. Its the only time I have ever done it! It has reverted to El Capitan, which I guess I must have been on before the upgrade. The big question now is: Do I attempt to upgrade to HS or leave it on El Capitan?
  5. jbarley, Feb 28, 2018
    Last edited: Feb 28, 2018

    jbarley macrumors 68040


    Jul 1, 2006
    Vancouver Island
  6. Fishrrman macrumors P6


    Feb 20, 2009
    I'd leave it on El Capitan and be happy.

    (Provided that there is no really specific reason why you NEED High Sierra...)

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5 February 28, 2018