iMac (retina 5K, 27 inches, end of 2015) randomly restarts without errors

My iMac has been randomly restart itself (about once per day) when it is idle.  Everyone knows the same problem?  I found a YouTube video and that's exactly what happened to my iMac: https://www.youtube.com/watch?v=ka7lUIeiH5E

I attended once - the computer was in (not sleeping) with the screen off, nothing CPU/GPU intensive market.  I suddenly heard a chime and saw that the computer restarted itself.  I logged.  There is no window pop up.  I launched the Console and did not see anything unusual before the reboot.

More information:

  1. The computer is idle when restart occurs.  Nothing on the computer indicates overheating.  Display is off (for inactivity) and fan is quiet.
  2. There is no trace of the software stop, panic the kernel or crash.  System log shows the normal activities, and then a sudden entry BOOT_TIME, as if someone pulls the power cord.
  3. It is not a failure, because the computer must be turned off if this is really a power failure.  "Start automatically after a power failure" is not checked.
  4. It started happening after I came back from a trip and upgraded my iMac to the latest Mac OS X five days ago.  This computer was purchased in October and I had never seen anything like this until a few days ago.

Comments on the YouTube video suggests a total prosthesis, but I hesitate to do so if it turns out to be a software/firmware problem that can be fixed. -The computer is heavy and the closest Apple Store is not very close, not to mention the efforts of backup/restore.

Thank you

Seems to be a problem with 10.11.4. No doubt you did not have this problem before installing 10.11.4

Further discussion on this issue here: 5 k iMac restarts on its own after you install 10.11.4 unexpected restart

I think it is highly unlikely that it is material, as all signs point to a software problem (no problems before the update to 10.11.4 and everyone does the same behavior (unexpected random reboots) and the error code ('previous stop cause - 128' - which nobody seems to know what that means exactly) after updating to 10.11.4.) In any event, hardware problems usually come right out go the box or after tinker you with the machine somehow like the installation of ram, add devices, etc. and later, you start to experience unexpected behavior. None of this seems to happen with this issue.

Tags: Mac

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    10 command "diskutil cs type list" to check the resulting fusion drive created.

    CoreStorage groups of logical volumes (1 found)

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    + Logical Volume - Group F53C7A25-C2F3-4997-91E9-2E6B6BAB2E0E

    =========================================================

    Name: LVG

    Status: online

    Dimensions: 1815635525632 B (1.8 to)

    Free space: 90112 B (90.1 KB)

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    +-Physical volume E176873C-7C80-4759-8110-BA7307E0C4B3

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    +-Physical volume 6535AC3C-DCF8-453F-AD47-98905538386E

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    |   Index: 1

    |   Disc: disk1s2

    |   Status: online

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    +--> Logical volume family F3D15F87-FB84-4B43-B2F2-E9EACC7C42D9

    ----------------------------------------------------------

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    +--> Logical volume 0D807F6E-FB7C-418F-AAF4-EF3EA3525D10

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    Status: online

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    Reversible: no

    Name: Macintosh HD

    Volume name: Macintosh HD

    Content indicator: Apple_HFS

    LVG Type: Fusion, sparse

    11 exit the terminal, go back to OSX El Capitan install screen and select the name of the fuser unit 'Macintosh HD' proceed to begin the installation of the os x for installation.

    12. There will be a step in the installation ask you if you want to configure as a new computer, or restore from a time machine previous backup. Make your own choices it accordingly.

    13 once OSX El Capitan has been installed and you have finished restoring the data and custom configurations, you can enter the application of preferences to check if you see the icon of the "Startup" disk", and if you choose Startup BootCamp in the next reboot, you should be able to boot up to Windows without pressing and holding the button option when reboot and choose to start windows manually. Also, in windows, you should be able to click on the bootcamp Control Panel and select for a startup to OSX on the next reboot.

    14. one thing to be aware, if you install bootcamp in this way, the boot camp and the GUI utility disk in OSX El Capitan will not be able to adjust your settings. This means, if you need to touch anything or to readjust the size of the partition, you will need to do it again in step A. Alternatively, some how to get started with installing Mac OSX Yosemite USB, then adjust the partitions using similar commands shown in this article or other articles in this community.

    15. yet once please take personal responsibility on damage if you follow the instructions in this article.

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