2011 iMac won't go to sleep.

[roberthallin]

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]

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

 

[T'hain Esh Kelch]

Try and write the following in your terminal:

syslog | grep Wake

 

[Dopeyman]

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]

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]

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]

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.

https://forums.macrumors.com/threads/1780242/

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.

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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.

 

[Chippy99]

Only "UserIsActive" and "ExternalMedia" are set to 1.

Well there's your answer anyway.

What process is listed at the bottom, under those headings? In particular UserIsActive?

 

[claaariii]

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!

 

[MultiFinder17]

I was just about to recommend the printer queue to this fellow as well