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Question: Mac OS X High Sierra restart without notice

I just upgraded to Mac OS X High Sierra. While playing iTunes my Mac logged out of everything without any notice and attempted to restart the machine - I was not even working on my Mac at the time. I happened to catch it so I stopped the restart. I'm sure this is a reproducible problem. What can I do to prevent this from happening again?

2.33 GHZ MacBook Pro, Mac OS X (10.5)

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Mar 13, 2018 5:14 AM in response to Russ Conte In response to Russ Conte

I had an issue with a system that would sometimes reboot without notice, and gave no information about why it needed to reboot (e.g. your computer shut down because of a problem...")


my suggestion is to backup using Time Machine if you have not done so already

How to use Time Machine to back up or restore your Mac - Apple Support


check the device for any possible hardware issues

How to use Apple Hardware Test on your Mac - Apple Support


if none are present

disconnect all external devices and reset the SMC

How to reset the System Management Controller (SMC) on your Mac - Apple Support

repeat 2 or three times

reset the nvram

How to reset NVRAM on your Mac - Apple Support

repeat 2 or three times

boot into safe mode

Use safe mode to isolate issues with your Mac - Apple Support

then reboot normally


if the issues persists use recovery mode to reinstall the OS

https://support.apple.com/en-us/HT201314

About macOS Recovery - Apple Support

Mar 13, 2018 5:14 AM

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Question: Mac OS X High Sierra restart without notice