2019 27 inch iMac doesn't wake from sleep when trying to wake using magic mouse or keyboard

Benz63amg

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Oct 17, 2010
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This has happened twice now, after a period of time that my iMac is in sleep mode. i go to wake it up by pressing any key on the keyboard or pressing the magic mouse but nothing happens and i have to physically press the power button once on the imac itself to wake it up from sleep at which point it wakes up right away, why is this happening and how do i fix it? It doesn't happen all the time but it happened twice now during the one week period of me owning this iMac.

The iMac's sleep settings are as seen in the screenshot attached
 

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curmudgeonette

macrumors 6502a
Jan 28, 2016
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i go to wake it up by pressing any key on the keyboard or pressing the magic mouse but nothing happens and i have to physically press the power button once on the imac itself to wake it up from sleep
That's now normal. The Mac has gone into hibernation mode and powered everything down.
 

Benz63amg

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Oct 17, 2010
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That's now normal. The Mac has gone into hibernation mode and powered everything down.
How is it normal though? Why would i need to PHYSICALLY press the power button of my iMac just to wake it from sleep? is there anything i can do in the Sleep Settings panel in the System Settings menu under energy saving to prevent this from happening?
 

bondavi

macrumors newbie
Apr 4, 2019
27
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Sacramento, CA
FWIW on my system I have the top checkbox "Prevent from sleeping automatically....." unchecked, and I have no problems waking with the KB or mouse. Try that.
 
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Benz63amg

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Oct 17, 2010
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FWIW on my system I have the top checkbox "Prevent from sleeping automatically....." unchecked, and I have no problems waking with the KB or mouse. Try that.
Ok, I just switched that setting off, What do you have "Turn Display Off after:" set to ? That setting is also responsible for automatically putting the mac to sleep, Correct? So if i have that set to 10 minutes, it means that after 10 minutes of inactivity the screen will turn off and the computer will enter sleep mode?
 

DeltaMac

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Jul 30, 2003
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You can see the rest of your sleep and power settings in your System Information app/Power tab.
Note especially the number after "Hibernate mode". Normal should be 0 (and not usually 1,3, or 25)

If your bluetooth devices (or USB input devices) don't wake your new iMac, that's likely you have inadvertantly changed settings that take your system to a deeper hibernation mode. It takes you closer to full power off, but does come back up quite quickly with a short press of the power button. That's beyond normal sleep, to the actual hibernation mode, or (deeper yet) safe sleep mode. You will likely notice a short recovery out of that mode, as it loads your RAM information back into the system. It would show a washed out version of of the desktop, with an odd white recovery bar. A few seconds, and you are back up and running.
Maybe this link will help you - https://www.lifewire.com/change-mac-sleep-settings-2260804
 
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Benz63amg

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Oct 17, 2010
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You can see the rest of your sleep and power settings in your System Information app/Power tab.
Note especially the number after "Hibernate mode". Normal should be 0 (and not usually 1,3, or 25)

If your bluetooth devices (or USB input devices) don't wake your new iMac, that's likely you have inadvertantly changed settings that take your system to a deeper hibernation mode. It takes you closer to full power off, but does come back up quite quickly with a short press of the power button. That's beyond normal sleep, to the actual hibernation mode, or (deeper yet) safe sleep mode. You will likely notice a short recovery out of that mode, as it loads your RAM information back into the system. It would show a washed out version of of the desktop, with an odd white recovery bar. A few seconds, and you are back up and running.
Maybe this link will help you - https://www.lifewire.com/change-mac-sleep-settings-2260804
I just looked under the Power settings in system informations and it says "Hibernate Mode: 3", I only owned this 2019 iMac for a week. (See screenshot below)
[doublepost=1555129219][/doublepost]
I have mine at 15 minutes. It turns the display off, but the Mac is on in the background, locks your session.
How so? My understanding is that the Display Off After "X" amount of minutes is also the very same setting that tells the iMac to go to sleep after the defined Minute count. How else would you configure your iMac to go to sleep after a certain amount of time?
 

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DeltaMac

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Jul 30, 2003
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The article that I posted tells you how to use the "pmset" command to change the hibernation mode. Simply replace the X, with 0, 1, or 25. I recommend 0(zero) for your purposes.
A desktop, such as your iMac, probably should be on zero by default. I have no idea how to tell you what might have changed that, but you can certainly change it back to zero.
Here's another article that has the same information as the man in your terminal for the pmset command.
https://www.dssw.co.uk/reference/pmset.html
You can use THAT to make the changes that suit you better.
 

Rumpot

macrumors newbie
May 25, 2012
29
2
Did you ever get this resolved? I'm having the same issue, sorta. It will wake after ~ 2minutes
 

Benz63amg

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Original poster
Oct 17, 2010
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Did you ever get this resolved? I'm having the same issue, sorta. It will wake after ~ 2minutes
No I never got this resolved, the iMac only goes to this “deep sleep” mode that requires the press of the power button on the back to wake up from only when my iMac has been asleep for a rather long duration of time it seems (sometimes I don’t use the computer for an entire day (24 hours or so) and when I come back to wake it it’s in deep sleep and requires the annoying button press. I didn’t want to mess with any terminal scripts as suggested by fellow members here on the forum in fear of ruining anything with the OS, maybe OSX Catalina will fix it.
 

Rumpot

macrumors newbie
May 25, 2012
29
2
That's a shame, I would find that unacceptable. Have you at least tried calling Apple Support and have them do the troubleshooting? That's my next step. For me, if they can not fix it, it's going back.
 

Benz63amg

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Oct 17, 2010
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That's a shame, I would find that unacceptable. Have you at least tried calling Apple Support and have them do the troubleshooting? That's my next step. For me, if they can not fix it, it's going back.
Why is it a shame? It’s a feature in MacOs that puts the iMac to deep sleep to conserve energy if it’s been asleep for a long duration of time. I dislike it very much but perhaps OSX Catalina will function differently or offer a setting to counteract it.
 
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Rumpot

macrumors newbie
May 25, 2012
29
2
Why is it a shame? It’s a feature in MacOs that puts the iMac to deep sleep to conserve energy if it’s been asleep for a long duration of time. I dislike it very much but perhaps OSX Catalina will function differently or offer a setting to counteract it.
I thought deep sleep or whatever would display the gray looking screen with the white stars bar, even that is supposed to start when you hit a key. Im not judging.

After speaking with AppleCare they said it should be instant , 5 sec max. In my case my machine is defective and they are sending a new one( they had me reset the nvram, and it stopped booting)
 

Benz63amg

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Oct 17, 2010
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Not experiencing this but I have Power Nap Enabled checked.
PowerNap was enabled by default on my 2019 iMac out of the box so perhaps with that setting left untouched (Enabled by Default) the iMac would never exhibit the deep sleep behavior I’m experiencing but then there’s also the fact that the iMac will never truly sleep if Power Nap is enabled as it keeps some processes running in the background I’m assuming as per the definition of PowerNap in the System Settings Menu (It lets the iMac check email etc while in sleep)
 

Benz63amg

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Oct 17, 2010
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I’ve experienced the same but only once on my iMac: when both the keyboard and trackpad batteries were almost dead. With devices having more charge, it has never happened.
Battery is very low in my mouse and keyboard about 50%, perhaps that’s another factor to this deep sleep behavior
 

SalisburySam

macrumors member
May 19, 2019
69
54
Salisbury, North Carolina
Battery is very low in my mouse and keyboard about 50%, perhaps that’s another factor to this deep sleep behavior
50% doesn’t seem low enough to cause these problems, unless there is something blocking the signal between the devices and the computer. By low, I meant approaching dead, so 1-3%. But in any case worth checking.
 

xgman

macrumors 601
Aug 6, 2007
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Who needs top save this much energy? can't really be much if you let just the monitor sleep...
 

ZipZap

macrumors 603
Dec 14, 2007
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I used to have this issue with my older iMac because I used incompatible memory modules.
 

Benz63amg

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Oct 17, 2010
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I used to have this issue with my older iMac because I used incompatible memory modules.
The issue first happened before I upgraded the ram on the iMac so it’s not third party ram.