Screen will not go to sleep on iMac
My iMac display will not go to sleep. Here is my setting. OS 10.12.6
Any help would be appreciated.
John
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Reset the SMC, as per > How to reset the System Management Controller (SMC) on your Mac - Apple Support
Then set the slider up up a couple of minutes and wait for the display to go to sleep without touching your mouse or keyboard. If it does not sleep or wakes immediately, then you may have a faulty mouse, keyboard or other USB device that is preventing display sleep.