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recently I have had a rather odd issue concerning the MacBook Pro 13 inch (early 2015) where it would crash after being unused for periods of 60-80 min when connected with a DisplayPort Cable to an external 4K display. It was plugged in every instance where it would crash. Additionally, when I disconnected the DisplayPort Cable and opened up the MacBook to use its normal display, it showed a black screen. However, the trackpad appeared the show functionality, but using the screen and keyboard brightness buttons yielded no responses.

Any ideas as to why?

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    Welcome to Ask Different! :) Have you tried testing the MBP in Safe Mode to see if the problem still occurs? Also, can you edit your question (there's an edit link below it) to clarify how you're using your MBP? For example, your question title refers to Dual External Monitor but your question doesn't expand on this. Are you just using the one external display, or two? It may also be worth including the exact model of your display(s).
    – Monomeeth ♦
    Apr 17, 2017 at 23:28

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I am having similar issue on iMac (Retina 5K, 27-inch, Late 2015), see: Displays randomly remain blank when waking up

An engineer was assigned to my case in Apple Support. I recommend getting support from Apple too.

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