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Q: 5k iMac reboots on it's own after installing 10.11.4

Hi,

 

I installed 10.11.4 on March 24 (I believe), and since that day my iMac has been unstable. It reboots on it's own, like a kernel panic but never logging a kernel panic. This reboot doesn't seem to be triggered by software I run, as I've been removing things to try to isolate the problem.

 

Yesterday Apple Support had me reinstall the os via cmd-r boot option, and that did not solve the problem... it just ate up an hour of my time.

 

Any suggestions? My iMac went from super stable to super unstable; it's worse than my Windows gaming pc for stability now.

iMac (Retina 5K, 27-inch, Late 2015), OS X El Capitan (10.11.4), 32GB ram

Posted on Mar 29, 2016 4:57 AM

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Q: 5k iMac reboots on it's own after installing 10.11.4

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  • by waanid,

    waanid waanid Jun 11, 2016 2:09 PM in response to jevel
    Level 1 (4 points)
    Jun 11, 2016 2:09 PM in response to jevel

    For me, by now this has become a daily routine: I start working, at some point my Trackpad 2 freezes, and my Imac spontaneously reboots. I resume working, once my Imac 5K has rebooted and my open windows have reopened. It's quite normal, and yet quite absurd. Meanwhile, I'm practicing patience.

  • by Filler27,

    Filler27 Filler27 Jun 11, 2016 3:40 PM in response to Filler27
    Level 1 (4 points)
    Mac OS X
    Jun 11, 2016 3:40 PM in response to Filler27
    Update on my own predicament. I eventually gave up on the new Mac and took it back to the Apple store who swapped it out for a new one.  Delighted to report this one has no issues but it did came with 10.11.3 unlike the first one which was running 10.11.4 out of the box.  I will be in no rush to update anytime soon
  • by StigBull,

    StigBull StigBull Jun 14, 2016 4:07 AM in response to Filler27
    Level 1 (18 points)
    Desktops
    Jun 14, 2016 4:07 AM in response to Filler27

    Same problem here as everybody else. Mdi 2015 5K iMac, purchased 18.08.2015.

    Swapped the original 8GB memory with 32GB Crucial memory and have had reboots, but only when it's sleeping. It has happened maybe with 3 weeks time inbetween, but it seems to be more often now.

     

    Did run memtest86, left it going for almost 20 hours. No errors on the Crucial memory, but I reinstalled the 8GB original memory yesterday and will leave it running, it if stays up for more than 1 month I know it's the memory, even though it came through clean.

     

    By the way, there's a lot of people complaining about this very same Crucial memory on their forums, with iMacs. If you have Crucial mem, see if you have this model:   CT2C8G3S160BMCEU.C16FER

  • by StigBull,

    StigBull StigBull Jun 14, 2016 10:11 AM in response to StigBull
    Level 1 (18 points)
    Desktops
    Jun 14, 2016 10:11 AM in response to StigBull

    And now, for the 2nd time in two or three weeks, the iMac comes out of sleep, but the display remains off (so does the secondary monitor).

     

    I know it's on and working, I can VNC into it from my iPad Pro, and the desktop shows in VNC just like everything is normal.

    Can't find anything out of the ordinary in system.log either.

     

    Now this sure sounds like a hardware failure, right?

  • by GNW3,

    GNW3 GNW3 Jun 15, 2016 11:31 AM in response to StigBull
    Level 1 (9 points)
    Mac OS X
    Jun 15, 2016 11:31 AM in response to StigBull

    system.log may not be the best place to look.  The pmset utility can display logs relevant to power management (see "man pmset").

     

  • by StigBull,

    StigBull StigBull Jun 16, 2016 3:36 AM in response to GNW3
    Level 1 (18 points)
    Desktops
    Jun 16, 2016 3:36 AM in response to GNW3

    Thanks, I didn't realise pmset had a log option (Ihave only used it with 'assertions' in order to see why my iMac wouldn't go to sleep)!

    Are those logs the same .asl data files that are in /var/log/powermanagement?

     

    However it shows nothing out of the ordinary in the few moments before I pressed a key, and untill I powered it off.

  • by jevel,

    jevel jevel Jun 16, 2016 3:40 AM in response to jevel
    Level 1 (4 points)
    Desktops
    Jun 16, 2016 3:40 AM in response to jevel

    Since friday I've had two reboots while the machine was not in use. That means that the downgrade did not solve my issues.  -KJ

  • by waanid,

    waanid waanid Jul 19, 2016 9:41 AM in response to jevel
    Level 1 (4 points)
    Jul 19, 2016 9:41 AM in response to jevel

    I can confirm that installing the 10.11.6 Combo Update does not solve the issue. So far, I've had one random reboot, following one of two common patterns: I return to my iMac 5K, finding that it has rebooted on its own.

     

    As of yet, I've not had a random reboot while working on my iMac, with the Magic Trackpad freezing—the other common pattern. As soon as that happens, I'll let you know.

     

    I've had this issue for months now. June 7th, a very helpful Apple Support technician reached out to me by phone from the U.S., looking into this issue.

     

    By now, my patience is wearing very thin, however.

     

    The past few weeks, I've come to suspect that random reboots occur only occur while iTunes (12.2.4.2 and earlier versions) is running, with or without it playing music.

  • by waanid,

    waanid waanid Jul 22, 2016 12:19 AM in response to waanid
    Level 1 (4 points)
    Jul 22, 2016 12:19 AM in response to waanid

    Having updated to 10.11.6, I just had a random reboot while working, following the second of two common patterns: the Magic Trackpad suddenly locks and my iMac freezes, after some thirty seconds the iMac reboots to the login screen.

     

    So, from my experience, updating to 10.11.6 definitely does not resolve the issue.

  • by hs1,

    hs1 hs1 Jul 25, 2016 2:09 PM in response to waanid
    Level 1 (18 points)
    Desktops
    Jul 25, 2016 2:09 PM in response to waanid

    I just started to post a reply and I got a random restart.  Ironic I guess. (trackpad freeze, screen freeze, followed by restart with chime and no error messages displayed)    Apple engineer called me earlier today to see if I was still experiencing random restarts and I said I had not had any random restarts since July 16th. Since my last post I tried a few things to eliminate potential causes.  I removed the OWC memory sticks (2x16gb) and left the stock 8gb installed.  It still random rebooted 4 times the same day 15th June.  I took out the stock memory and put my 32 gb OWC memory back in. No restart again until 16 July and then today.  I was running iTunes when today's freeze/restart occurred, but had not been running iTunes on any of the previous random restarts.  This is first one since 10.11.6 update.  So while they are fewer and further between, I am still experiencing random restarts.

  • by Terry Murphy,

    Terry Murphy Terry Murphy Jul 27, 2016 9:08 PM in response to avoidwork
    Level 2 (289 points)
    Jul 27, 2016 9:08 PM in response to avoidwork

    Unresolved in 10.11.6

  • by Jeremy Liu,

    Jeremy Liu Jeremy Liu Aug 5, 2016 11:07 PM in response to Terry Murphy
    Level 1 (20 points)
    Desktops
    Aug 5, 2016 11:07 PM in response to Terry Murphy

    Terry, did Apple Support tell you they are still working on it?  I have not contacted support yet and am wondering if I should also contact them so that this issue is more escalated.

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