I had a vexing issue the last few days with 1 of 3 external monitors on Mac OS X 10.11.6, where this one display would not wake up after the computer or display went to sleep. I switched around the monitors, unplugged and replugged them, and nothing seemed to help. I went to the point of disconnecting the monitor and replacing it with another extra display. This worked–to a point. Then, it happened all over again. I thought it was the port on the video card, since this is a Mac Pro with 2 cards. Eventually, any monitor plugged into this port would not wake back up after sleep.
Low and behold, I found a fast and easy solution–since it’s only been one time since the monitor has done this since I found the new trick, I can’t say for sure if it’s still a software issue, or a hardware issue, however, this trick worked to get the monitor lit up without unplugging or restarting:
1.) Go to System Preferences –> Displays
2.) Hold down the Option key and click on the “Gather Windows” button
3.) Click on “Detect Displays”
At this point, the sleeping monitor should wake right up!
Incoming search terms:
- sleeping HD x**
- new xx hd poran