ohw0205
Level 1 (11 points)
Mac OS X

Q: Boot Camp Assistant causes unexpected reboot (crash?) on macOS Sierra

Trying to use Boot Camp with macOS Sierra on a late-2013 iMac. Boot Camp Assistant seemed to properly modify the USB drive as well as repartition the HDD.

Subsequently, it asked for the password to unlock system preferences. Immediately after the password had been entered, the system rebooted without further notice. It did not boot from the USB drive, nor did Boot Camp Assistant resume after logging in. Therefore I believe this was an unexpected reboot (a crash?). Notably, the iMac had lost network connection after the reboot! After another (manual) boot, the system appeared to be back to normal operation.

 

Has anyone experienced this behaviour? Is this a known bug in macOS Sierra?

Any chance to cleanly complete the process?

 

Best regards

iMac (27-inch, Late 2013), macOS Sierra (10.12)

Posted on Oct 22, 2016 1:05 PM

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ohw0205

Q: Boot Camp Assistant causes unexpected reboot (crash?) on macOS Sierra

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  • by Loner T,

    Loner T Loner T Oct 22, 2016 9:39 PM in response to ohw0205
    Level 7 (24,855 points)
    Safari
    Oct 22, 2016 9:39 PM in response to ohw0205

    What other external devices and/or storage did you have connected to your iMac during this installation?

  • by ohw0205,

    ohw0205 ohw0205 Oct 22, 2016 11:30 PM in response to Loner T
    Level 1 (11 points)
    Mac OS X
    Oct 22, 2016 11:30 PM in response to Loner T

    External devices connected:

    - Time Machine backup HDD (switched off)

    - USB wireless kb/mouse (switched off, using Apple kb/mouse instead)

     

    Maybe unrelated to this problem, I found that my wireless USB 3-button mouse would intermittently freeze as soon as a USB stick was connected. Since this never occurred in ElCapitan, I suspect it's another newly-introduced bug in Sierra...

  • by ohw0205,

    ohw0205 ohw0205 Oct 23, 2016 1:53 AM in response to ohw0205
    Level 1 (11 points)
    Mac OS X
    Oct 23, 2016 1:53 AM in response to ohw0205

    Just gave it another try:

    - physically disconnected all external devices

    - removed Windows partition

    - re-initiated partitioning and Windows installation (3rd item in Boot Camp Assistant task list)

     

    => Same result: reboot as startup disk preferences are being modified; machine comes up without network ; back to normal after another reboot

    => No (obvious) way to get Windows installed. Annoying ...

  • by Loner T,

    Loner T Loner T Oct 23, 2016 6:52 AM in response to ohw0205
    Level 7 (24,855 points)
    Safari
    Oct 23, 2016 6:52 AM in response to ohw0205

    ohw0205 wrote:

     

    Just gave it another try:

    - physically disconnected all external devices

    - removed Windows partition

    - re-initiated partitioning and Windows installation (3rd item in Boot Camp Assistant task list)

     

    => Same result: reboot as startup disk preferences are being modified; machine comes up without network ; back to normal after another reboot

    Does the Windows Installer start? If not, is the NTFS-formatted partition still on the Mac? If yes, reset SMC/NVRAM, connect USB Installer, reboot Mac and hold Alt/Option key and if you have Windows and EFI Boot from the USB, try Windows first (this is the legacy BIOS installer). Try EFI Boot if it fails, which may also fail with a GPT vs MBR error, which can be corrected.