iMac 27" 5K - Turning Off

Discussion in 'macOS Mojave (10.14)' started by suffy67, Oct 1, 2018.

  1. suffy67 macrumors newbie


    Jul 12, 2009

    I have upgraded to the latest OS Mojave and ever since I have done this my iMac turns off and does not go to sleep.

    I always leave my machine on and now when I return I have to turn it on at the back instead of just pressing a key and then putting in the password.

    Does anyone know what could have changed.

    Many thanks in advance.

  2. dsjr2006 macrumors regular

    Jun 29, 2007
    Metro Detroit
    I had a similar issue, not with Mojave, but an app that was installed was causing a system hang and it was crashing. Check the console app in utilities. Searching the log just before it shut down might reveal something.
  3. Richdmoore, Oct 1, 2018
    Last edited: Oct 1, 2018

    Richdmoore macrumors 68000


    Jul 24, 2007
    Troutdale, OR
    My 27” 2017 iMac is currently at Apple getting serviced for this very issue. Fortunately Apple was able to reproduce it, the local store is working with Apple corporate (according to the tech I directly talked with) to figure out which components to replace.

    This web site helped me, I had several zero status shutdowns logged, despite using an apc ups system and being asleep when they occurred.

    I used the terminal command in Mojave listed on that web page, then looked up the codes (5 is normal, zero is power interruption).

    Fyi, my iMac was doing this on both high Sierra and Mojave’s.
  4. Richdmoore macrumors 68000


    Jul 24, 2007
    Troutdale, OR
    For what it is worth, Apple was able to reproduce it once, but they called it a display failure, but for some reason they are now insisting an macOS reinstall has fixed the problem.

    I am going to pick up the computer the next couple of days and hopefully it is actually fixed, but I am not confident in their fix at all.

    I will bring it into Apple again should the problem reoccur.

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3 October 1, 2018