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Question: iMac started booting on it's own

My iMac with Sierra 10.12.6 has started booting up on it's own in the morning and it's not something I have it set to do. The energy saver panel is not set on a schedule. This has been happening (I think) for a long time but I didn't realize it because the time it does it is at a time the computer would normally already be on. Since it's the holidays and I've been busy, I have not been turning on my computer at 5:30am as usual and have been coming into my office at 6am and then it's already on. The past 2 days it has spontaneously started up on it's own at 5:54am. At first I thought it was having an error at shutdown and not shutting down, and that I just didn't catch it so it stayed on all night, but last night I made 100% sure it was shut down and rechecked it a few hours after shutting down to make sure. I came in late again this morning at 6am and it was already on. I checked the console system log and it shows the sequence of shutdown and startup for the last two days -- keep in mind that the boot time is NOT initiated by me:

Dec 8 16:29:18 Macintosh-HD-3 shutdown[9500]: SHUTDOWN_TIME: 1512772158 298924

Dec 8 16:29:18 Macintosh-HD-3[1] ( System shutdown initiated by: shutdown.9500<-sessionlogoutd.9497<-launchd.1

Dec 9 05:54:52 localhost bootlog[0]: BOOT_TIME 1512820492 0

Dec 9 18:43:10 Macintosh-HD-3 shutdown[12291]: SHUTDOWN_TIME: 1512866590 864511

Dec 9 18:43:10 Macintosh-HD-3[1] ( System shutdown initiated by: shutdown.12291<-sessionlogoutd.12287<-launchd.1

Dec 10 05:54:52 localhost bootlog[0]: BOOT_TIME 1512906892 0

It shows that I did shut down the computer. There have been many times over the past few years when we traveled that I would find my computer on when we got home and I could not figure out how that happened. Now I believe that this has been happening for a long time and I didn't know it only because I usually turn on my computer before it would do this on it's own. I have also had an ongoing problem with it periodically popping a message up late morning saying the computer is scheduled to go to sleep (IT IS NOT) and I have to cancel it. That has not happened for awhile but it carried over from my previous computer to this newer one less than a year ago. If anyone know why this might be happening let me know. thanks.

iMac with Retina 5K display, macOS Sierra (10.12.6)

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Dec 10, 2017 7:44 AM in response to Jill Roberts In response to Jill Roberts

Might be a corrupt .plist.

Do a backup, preferably 2 backups on 2 separate drives.

Quit System Preferences.

Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Select Library. Then go to Preferences/ Move the .plist to your desktop.

Restart the computer, open the application, and test. If it works okay, delete the plist from the desktop.

If the application is the same, return the .plist to where you got it from, overwriting the newer one.

Thanks to leonie for some information contained in this.

Dec 10, 2017 7:44 AM

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Dec 11, 2017 3:41 AM in response to Eric Root In response to Eric Root

Thank you for the suggestion. You said: "Restart the computer, open the application, and test. If it works okay, delete the plist from the desktop.". What application are you referring to? There is no specific application at play here.


Dec 11, 2017 3:41 AM

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Dec 11, 2017 6:23 AM in response to Jill Roberts In response to Jill Roberts

The right way to shut down is close all applications ( command + tab + Q ) only finder must be opened .

turn wifi as off , press control , option and command and power key simultaneously on the keyboard .

Wait for a while , a small circle will rotate and the screen will go black .

If it is laptop close the lid .If booting time is high can run safe mode , NVRAM / PRAM could help in some way .

Make sure no third party apps , cleaners , anti - virus must be used in the system before or after clean installation .

But in your case it does't shut the applications and some applications are running in the background .

You can also visit apple authorised service centre and show your Mac to them .

Just read this article macOS Sierra: Erase and reinstall macOS

Dec 11, 2017 6:23 AM

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Dec 11, 2017 8:18 AM in response to Jill Roberts In response to Jill Roberts

Did deleting the .plist change anything?

Try running this program in your normal user account, then copy and paste the output in a reply. The program was created by etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. On the screen with Options, please open Options and check the bottom 2 boxes before running. Click “Share Report” button in the toolbar, select “Copy Report” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

Dec 11, 2017 8:18 AM

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Dec 11, 2017 2:05 PM in response to Eric Root In response to Eric Root

I have not deleted the plist and there is no way I am erasing my computer and doing a clean install and then have to take hours and hours to fix the resulting mess so my computer will work properly again. I have a business and can't do that....I just do not have time to deal with this if that is what needs to be done. I was hoping someone here would have heard of this and know something simpler to do. I would rather just turn off the power strip at night so it is unable to start itself. I really do appreciate the suggestions but at this time, I don't want to do anything that will cause me more work than I already have. Thank you for trying to help.

Dec 11, 2017 2:05 PM

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Question: iMac started booting on it's own