2011 iMac won't go to sleep.

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for week 27" imac has stopped going in sleep-mode when want to. it's running mavericks 10.9.5, , i've tried dissconnecting attached cables, unchecked "wake network access" , that's pretty it. screen shuts off, computer stays on. has got ideas might going on? restart won't fix :)
 

mine doing same thing. 2011 imac i7 3.4, 1tb fusion. have 27" tb display , elgato tb dock attached couple usb 3.0 drives.

has upgrade 802.11ac , bt4.0. running yosemite 10.10.2
 


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