I have a 2013 Mac Pro (Darth Vader garbage can) edition. I just upgraded today to MacOS from OS 11.11 El Capitan.
My 4K AOC monitor (U2879VF) is no longer working. It is connect to the MacPro using a miniDisplay port to Display port cable. It was working fine with El Capitan.
Any thoughts?
Mac Pro, macOS Sierra (10.12)
My 2013 MP works fine with Sierra with my Dell UP2414Q via mini displayport>displayport cable
Have yo reseated the cable ends?
Next:
- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
https://support.apple.com/en-us/HT201295
https://support.apple.com/en-us/HT204063
- Try starting in Safe Mode
Just to clarify, I have reset all my cables. Even changed my cables.
I was able to fix the problem. I had to reset the PRAM on my system by using the Option-Cmd-P-R key sequence when rebooting my system.
Why is my 4K display not working with macOS on a mac pro?
