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I had 3 external monitor setup connected to my Mid 2015, 15" MacBook Pro. This used to work fine with OS X El Capitan which I have been using for past 3 years.

I recently upgraded to macOS Mojave, and now my MacBook will only connect to any of the 2 monitors at a time. I will not connect 3, and can have HDMI and DVI, or DVI and VGA, or VGA and HDMI, but won't connect all the 3 at same time.

For my workflow, I need 3 monitors to be connected. Any reason which may be preventing this setup from working in macOS Mojave? I should add that the machine won't detect the 3rd monitor, but if I unplug either of them, is does see the 3rd one.

  • Welcome to Ask Different :) What is the make and model of your Mac? – Nimesh Neema Jun 21 at 2:21
  • MacBook Pro (Retina, 15-inch, Mid 2015) Mojave 10.14.5 this worked fine on el capitan for me for 3 years – mark pendrick Jun 21 at 12:46

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