MacOS 13.4 Ventura - External Monitor no longer detected. Worked until the update to 13.4

Thank you.

I had previously tried detect displays, restarting, pulling cables, etc.

After the last restart, I re-searched the issue online and found this post. The first two didn't seem to apply but I figured wouldn't hurt trying the unplug usb-c at the (MB Pro Intel) port...

Voila, the monitor came back on and was recognized (VP2768-4K) as it has been for a long time until this issue arose yesterday (Not sure why it started yesterday 2024-01-03 for me).

TLDR:

• symptom 2 different (VP2768-4K,34UC89G)external monitors, 1 HDMI (34UC89G) 1 USB-C (VP2768-4K), but both monitors show as 34UC89G (whereas previously they were correctly detected.
• Solution (for me): restart mac, unplug then replug in the USB-C connected monitor at the mac usb-c port.

Hi KiriKuru -

Is this the same thing? It doesn't show the part from and after the .display . . . so I'm not sure I have the right thing here but I don't see anything else close to it:

If not, can you provide guidance on how to navigate to the correct .plist, I would be eternally grateful.

Doesn’t work.

I just confirmed my MacBook Air M2 (OSX10.31a) works fine but when my M1 Macbook Air OSX 13.4 is connected to same setup the extended doesnt work. The monitor works but one I swipe screens it swipes both on the laptop and 27inch while in Extended Display mode.

divinetruth wrote:

I just confirmed my MacBook Air M2 (OSX10.31a) works fine but when my M1 Macbook Air OSX 13.4 is connected to same setup the extended doesnt work. The monitor works but one I swipe screens it swipes both on the laptop and 27inch while in Extended Display mode.

What does mean? One swipe screen? Can you explain?

When I use 3 fingers on the trackpad it changes to my other desktops ( I have many open) e.g fullscreen Mail, next screen could be Safari pages etc.

Now when I swipe on say one screen (Macbook) then the extended screen is also changing at the same time (usually just showing a blank screen) and vica versa on the 27inch screen its connect too.

This:

It's already checked in my MacOS Ventura 13.4. I turned it off and turned it on following the same steps but mac is still not detecting second external monitor. Just to clarify, I am able to see first external monitor but not second external monitor from the time I updated mac to Ventura 13.4.

Anything else I can do?

Hi,

Can you use usb-c port to other devise ?

Because I have same situation and I thaught issue cause by video signal. But my MBA’s usb-c port can’t connect other devise too. I can use other one port.

I use adopt daisy chain MBA→(usb-c)→DELL monitor→(usb-c)→Thunderbolt doc.

Of course this is not a legitimate solution as my usb-c port remains unusable, pending an update resolution by Apple, but I hope this helps everyone.

Hi All, i have the update as well. I have the MacBook Air with 2 external monitors connected that were working fine up until the update over night.

The main display and the 1st external we were working and the 2nd external wasnt.

I have restarted the machine many times and followed a few of the solutuions. After all this, now the 1st external monitor is not coming on.

Any one have a solution?

brinder146,

Did you try swap the cables to external monitors yet ?

If the second monitor comes up and the first one does not, it may be the same as mine, I think one of the USC-C ports is out of service.

I have a MacMini M2 Pro and I've always used two monitors on it, both the same: LG 27 144hz. One of the monitors I use via direct HDMI and the other via cable on the usb cable c > displayport.

Today I was away from the computer for about 2 hours and when I returned the monitor on the right, which I use via usb c > displayport, stopped being recognized on the MacMini.

There was no power outage while I was away, because when I got back everything was on. Nobody moved. Absolutely nothing happened. Even this morning it worked correctly.

Note: I have a Macbook M1 Pro from the company that I work from and the second monitor is working on it (using an hdmi cable), giving indications that the problem is supposedly in the usb c > displayport cable.

Everything was working until today morning...

MacOS Ventura (13.4 22F66)

My Studio Display arrived today and it isnt connecting to either my air or pro, both on latest ventura OS, its powered on as its charging my laptops, just isnt displaying as an option in the display settings... ive tried everything!!

The whole point of sticking with apple was so I can just plug and play, and this is what I relayed to my manager when making a case to expese it, pretty embarrassing now if ive to go to IT!

Have you tried using your monitor on another device? I tested it today and it looks like the DisplayPort input stopped working. I did the following test: I bought a new cable (usb c / displayport) and connected it to the monitor that had a problem, it still didn't work. It couldn't possibly be the cable, because the cable is new. So I decided to get the new cable and connect it to my other monitor (they are two identical monitors) and it worked correctly on displayport, so the problem is the monitor. Somehow the DisplayPort input on my monitor 2 has stopped working for no apparent reason.