2011 iMac won't go to sleep.

roberthallin

macrumors member
Original poster
Oct 25, 2009
88
25
Stockholm, Sweden
For about a week now my 27" iMac has stopped going in to sleep-mode when i want it to. It's running Mavericks 10.9.5, and I've tried dissconnecting all the attached cables, unchecked "wake for network access" and that's pretty much it. The screen shuts off, but the computer stays on. Has anyone got any ideas about what might be going on? A restart won't fix it :)
 

tpluth

macrumors member
Sep 24, 2014
85
20
Carmichael, CA
Mine is doing the same thing. 2011 iMac i7 3.4, 1TB fusion. I have a 27" TB display and a Elgato TB dock attached with a couple USB 3.0 drives.

It also has the upgrade for 802.11ac and BT4.0. Running Yosemite 10.10.2
 

Dopeyman

macrumors 6502a
Sep 5, 2005
597
28
Los Angeles!
Mine is doing the same thing. 2011 iMac i7 3.4, 1TB fusion. I have a 27" TB display and a Elgato TB dock attached with a couple USB 3.0 drives.

It also has the upgrade for 802.11ac and BT4.0. Running Yosemite 10.10.2
How did you upgrade your iMac to USB 3.0, 802.11ac and BT4.0?
 

Chippy99

macrumors 6502a
Apr 28, 2012
973
27
Try and write the following in your terminal:
Better, enter the following:

pmset -g assertions

It will show you specifically what's keeping your Mac awake.

If PreventSystemSleep or PreventUserIdleSystemSleep are set to "1", you can see which processes are causing this.
 

tpluth

macrumors member
Sep 24, 2014
85
20
Carmichael, CA
Better, enter the following:

pmset -g assertions

It will show you specifically what's keeping your Mac awake.

If PreventSystemSleep or PreventUserIdleSystemSleep are set to "1", you can see which processes are causing this.
Only "UserIsActive" and "ExternalMedia" are set to 1.
 

tpluth

macrumors member
Sep 24, 2014
85
20
Carmichael, CA
How did you upgrade your iMac to USB 3.0, 802.11ac and BT4.0?
USB 3.0 is via a Thunderbolt (TB) dock. I got the Elgato from OWC.

http://eshop.macsales.com/item/Elgato/10024010R/

802.11ac and BT 4.0 are via the upgrade in this thread, if you're not afraid to take your iMac apart.

http://forums.macrumors.com/showthread.php?t=1780242&highlight=2011

I have the same card in my Dual Xeon X5675 Mac Pro, too. Handoff and Continuity work on both machines. I did a similar upgrade to my 2011 Macbook Pros (13" i5 early 2011 and 17" i7 Late 2011) and Handoff and Continuity work on them, too.

----------

Try and write the following in your terminal:
Sleep is working this morning, but i'll keep terminal open and check it next time it won't sleep.

I did see some messages in Syslog from yesterday about assertions from USB, Bluetooth and Thunderbolt. I have 2 USB 3.0 drives connected via Thunderbolt and I'm using a Magic Mouse (BT) and a USB keyboard.
 

claaariii

macrumors newbie
Feb 12, 2010
8
2
I've had the same problem for 3 weeks, tried everything and just got help finally solving it - in my case there was a file in the printer queue waiting to print, and that was keeping the computer from sleeping!
 
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