My friend got a new MacBook Air, and sent me his old iMac13,1 (21.5”, 8GB RAM, 
1TB HDD, USB kbd/ms). I zeroed out the HDD and installed Sierra anew on it.

It has the problem of when it goes to sleep for more than 6 hours (or so), it 
goes into ‘hibernation' mode. It takes a click on the power button to get it to 
come back. But even then, it presents a hibernation wake screen, apparently 
restoring itself from the sleep image, like when you restart a MacBook that ran 
out of battery power: 
https://km.support.apple.com/library/content/dam/edam/applecare/images/en_US/osx/progress_bar_wake.png

I've set the following: 
    % sudo pmset standby 0
    % sudo pmset autopoweroff 0

The above prevents it from going into hibernation mode. When it tries to, it 
simply wakes itself up again. So I’ve got it now in this cycle, light-sleeping 
then a full wake up, over & over on its own, every so many hours. Not normal.

The Energy Saver prefs are all set to their defaults. Could this be a dead mobo 
cell battery?

-Carl

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