New iMac restarting itself soon after opening?

Discussion in 'iMac' started by Balthorn, Oct 16, 2016.

  1. Balthorn macrumors newbie

    Jun 9, 2016
    I recently bought a new 5K iMac 27 inch, I proceeded to restore it from my time machine backup, and then I proceeded to install a couple things onto it to get it up to speed.

    The only problem was about 10 minutes into using the machine, it randomly restarted on its own.

    There was no error message or warning, it just restarted itself on its own.

    Is this something I should be worried about? It hasn't done it since.

    I'm a little concerned. Thank you!
  2. maflynn Moderator


    Staff Member

    May 3, 2009
    Yes, as that's not normal.

    First do a clean reinstall of OS X, then see if the behavior continues, if so, then call apple and get the machine replaced. If it doesn't, I'd be looking at what you're restoring from TM
  3. Balthorn thread starter macrumors newbie

    Jun 9, 2016
    Thank you for the feedback.

    I'm only restoring a TM backup of about 50gb that had all my files on it from my old computer.

    I'll try a reinstall but I'm really starting to think I got a bad machine.

    The only thing is it hasn't done it since and I've been using it for over a day now.
  4. Taz Mangus macrumors 68040

    Taz Mangus

    Mar 10, 2011
    Maybe it related to something you restored. Depending on how you setup your Time Machine backup you could be restoring a system file that is causing the issue. The suggestion that maflynn gave you is good, try a clean install and see if it is the machine or if it is related to what you are restoring.
  5. Balthorn thread starter macrumors newbie

    Jun 9, 2016
    I suppose I will try and boot it from a fresh install of macOS, use for about 20 mins, see if it restarts itself again.

    Then I will do an install from the TM backup, and see if the restart happens.

    Should be a good plan?

    As this is close to a $3000 dollar computer, I'm really having a panic attack!
  6. Balthorn thread starter macrumors newbie

    Jun 9, 2016
    Does anyone have any more advice on this?


  7. Taz Mangus macrumors 68040

    Taz Mangus

    Mar 10, 2011
    If you do a clean install followed by a complete Time Machine reinstalll then you might be right back to where you are now, with the same issue. If you do a Time Machine restore don't restore any of the OS X system files just user account data.
  8. cynics macrumors G4

    Jan 8, 2012
    You have a year of warranty at least. I would worry about it, may have been some freak once in a life time glitch.

    I wouldn't do anything unless it does it again. To me, doing a fresh install is extreme for a single system crash. But a good first step in the event it happens again.

    I would probably try making it do it again and stressing the system as much as possible just for peace of mind.
  9. Fishrrman macrumors G5


    Feb 20, 2009
    Do you have automatic software updates turned on?

    If you do -- I'm wondering if some updated software was [automatically] downloaded from Apple, which then required a restart?

    If this happened only one time -- and if it hasn't repeated since then -- and if your iMac seems to be running "smooth and clean" NOW -- I wouldn't worry too much.

    If this starts repeating -- THEN it's time to take it to an Apple Store and inquire as to what's going on.
  10. Balthorn thread starter macrumors newbie

    Jun 9, 2016
    Thank you so much for the additional feedback, all.

    This is what I have been thinking.

    What's weird is it hasn't done it in about 3 days now. I've just been using it normally. And it did it only 10 minutes after starting it for the very first time. Maybe it had to warm up or something?

    I really just want this specific machine to work as I am tired of waiting and don't want to go through an exchange process. But if it's defective in any way I'd have to get a new one.

    I don't have automatic updates turned on as far as I know. It always asks me to approve updates and never does them automatically

    It's running perfectly and smooth now.

    But I'm just so concerned there's an unforeseen hardware issue going on that isn't detectable.

    I ran Apple diagnostics and it said all the hardware is fine, but as I understand it Apple diagnostics isn't overly accurate.

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