iMac shuts self off in sleep mode

Hi ralphfromworcester,

Thanks for using the Apple Support Communities! I'm sorry to hear you are having these issues with your iMac. If you are having unusual sleep or wake issues, you may find the troubleshooting steps outlined in the following article helpful:

If your Mac doesn't sleep or wake when expected - Apple Support

If you continue to have issues, it may be that your computer is hanging or running into an unresolvable error, either while asleep or while going to sleep/waking from sleep. If that is the case, you may also find the troubleshooting in this article useful:

OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem." - Apple Support

Regards

Here's what solved it for me; my iMac had started shutting down or logging me out during sleep several weeks ago:

Go into System Preferences

Click on Security & Privacy

Unlock to click Advanced

Click Privacy

Uncheck “Log out after __ minutes of activity,”

Then “OK”

If that wasn’t checked, then your problem is somewhere else. And I'd searched and tried all sorts of expert advice, but nothing had worked.

@ralphfromworcester: I of course meant -

Uncheck "Log out after __ minutes of inactivity"

(typo)

I of course meant -

Uncheck "Log out after __ minutes of inactivity"

(typo)