Monitor wakes up while mac is asleep.

I have a 27-inch iMac (end of 2012), I am connected to an external monitor Lg 2955um-p (29-inch Ultra wide) its connected Via a lightning strike to display the port. So here's the question. When I put the mac to sleep, the Mac and the external monitor turn off as "normal". Then after a few seconds, the external display turns, then falls asleep. This trend continues until I have power or unplug the external monitor. The search for this problem, all I could find was examples of screens do not wake up.

Check to see if the wake for network access box is selected in the system energy-saving prefrence.

Tags: Mac

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