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My Mac is connected to two Apple Thunderbolt Displays. The first monitor works without flaw. The second however will randomly turn off its screen 3 to 4 times a day. A quick but annoying fix is to un-plug and re-plugin the Thunderbolt connector. I have them daisy chained from my Mac Pro to the first display, then from the first to the second display. Devices such as Thunderbolt hard drives and my keyboard still work through the second display even when the screen is off. When I swap the displays, the one on the end of the chain will always turn off.

Running OS X 10.11.3, Mac Pro (Late 2013), Thunderbolt Display Model Number: MC914

  • Can you be more specific in your question like what model monitors, are they daisy chained, etc? What if you swapped connections? – Allan Mar 13 '16 at 1:46
  • I have just swapped the displays, now waiting for the screen to go blank. – NicholasB Mar 13 '16 at 2:40
  • The screen on the end of the chain will still turn the screen off. This probably means that the problem is not screen specific. – NicholasB Mar 13 '16 at 3:19
  • Do you see the same behavior with another mac? – howdytom Mar 11 '18 at 23:27

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