I have Samsung 5K display as a external display. It has worked as a dream earlier, but now with this new update (Ventur 13.2) it's not working anymore. It looks like some psychedelic pattern (staring longer guarantees a bad migraine attack).
Hey there 2009Lea,
Since noticing this issue between your Mac and display, have you had a chance to check out the connections or restart? If not, give this a try first to help:
Make sure that your display's power cable and video cable are connected securely and correctly at both ends. Learn more about how to connect a display to your Mac.
If you're using an adapter with your video cable, the adapter must support your display's resolution and refresh rate. Thunderbolt and USB-C adapters must also be compliant with DisplayPort Alt Mode, Thunderbolt 3, or Thunderbolt 4. If you're not sure about your adapter, try a different adapter or replace the video cable with one that doesn't require an adapter.
If the display is connected to a Mac laptop computer with a closed lid, make sure that the Mac is connected to power and using an external keyboard and mouse.
Continue with the additional troubleshooting steps in the link below:
If your external display is dark or low resolution - Apple Support
If you still need help, contact Apple Support.
Take care!
Thanks for the reply @hc1111
There is nothing wrong with the cables and contacts. I tested on another MacPro with an older operating system and it worked flawlessly. The problem is with the new operating system Ventur 13.2
Ventur 13.2 and external display do not work
