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I am trying to run two thunderbolt displays with my macbook pro and it will only run one at a time.

I have tried the displays with an older 17 inch model and it runs all three (including the internal screen) fine.

  • OS X 10.11.1
  • 2.5 GHz Intel Core i5
  • 8 GB 1067 MHz DDR3
  • Intel HD Graphics 4000 1536 MB
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I think it's that my laptop is on the edge of being powerful enough for both.

I made some space on my hard disk, stopped any applications from opening automatically on login and restarted whilst plugged in to both monitors.

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