iMac self-powering up

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Level 2

152 points

iMac self-powering up

I have a 10-year old iMac (now replaced with a newer model). I've taken to shutting it down as it's really only there as a backup computer. However just recently it's taken some nights to turning itself back on after I've done a shutdown.

I'm pretty sure it's properly gone to sleep as the Caps Lock light on the keyboard goes off, if I nudge the mouse nothing happens nor if I hit a key. It's quiet. No disc noise. It's switched off. Or should be !

Happens at midnight. Bizarre.

iMac, OS X 10.11

Posted on Apr 15, 2021 8:55 AM

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Answer 1

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Paul Conaway

Level 4

2,103 points

Apr 15, 2021 9:14 AM in response to Roger Sinden

Roger, check the Energy Saver preference pane. There are two checkboxes you might want to change "uncheck" are Wake for network access and/or Start up automatically after a power failure.

Power could have 'blinked' while you were asleep and maybe there was a scheduled process on your other mac that be checking the network for something.

Just a couple of thoughts.

Paul

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Answer 2

Roger Sinden Author

Level 2

152 points

Apr 15, 2021 9:47 AM in response to Paul Conaway

Many thanks, Paul, for the quick reply.

Start up automatically is unticked.

Wake for Network Access is ticked but doesn't this need the Mac to be powered up and in sleep mode ?

Roger

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Answer 3

Apr 15, 2021 1:00 PM in response to Roger Sinden

Roger, yes it does. Or at least that is my understanding. I haven't looked at the technical documentation though.

Paul

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iMac self-powering up

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