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Q: Tapping the power button doesn't put my 5k display iMac to sleep. Any possible reason?

I have a 5k retina display iMac, with Yosemite 10.10.4

 

It doesn't go to sleep if I just tap it. If I hold it for 3 secs, the option window would pop up.

 

I didn't see an option in System Preferences for this.

 

Help please. Thanks!

iMac with Retina 5K display, OS X Yosemite (10.10.4)

Posted on Aug 10, 2015 2:52 PM

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Q: Tapping the power button doesn't put my 5k display iMac to sleep. Any possible reason?

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