Why is my 4K display works only with Mac OS on a mac pro?

I have a Mac Pro (Darth Vader trash) 2013 edition.  I installed today to MacOS of OS 11.11 El Capitan.

My monitor AOC 4K (U2879VF) no longer works.  Using a miniDisplay port to display port is to connect to the MacPro.  It worked very well with El Capitan.

Any thoughts?

My MP 2013 works very well with Sierra with my Dell UP2414Q via mini displayport > cable displayport

Have yo reinstalled the cable ends?

Next:

-Try to reset memory NVRAM/PRAM and SMC

MacIntel: Reset of the controller (SMC) system management

https://support.Apple.com/en-us/HT201295

Subject of memory NVRAM and PRAM

https://support.Apple.com/en-us/HT204063

-Try to start safe mode

OS x: what is Safe Boot, Safe Mode?

https://support.Apple.com/en-us/HT201262

Tags: Mac

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