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?
Best Answer
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.