Monterey 12.3.1 External Monitor/Display Issue - No Longer Outputting Signal

Please call Apple, ask for a senior adviser and then report the problem. This is the only way we are going to get this fixed. We don't have the option of downgrading to Big Sur because this is a brand new computer that came with the DEFECTIVE Monterey iOS installed. We just spent another 1/2 hour on hold with Apple to find this out. So, we are totally screwed and my paralegal cannot even see to work on the tiny laptop. The senior advisor I spoke with told me that he had never heard of this issue and so did the initial person who answered the call.

Please also go to the top of this thread and click the box under cyeoman06's original post "I have this question too." The more people we have call and click this box, the more attention it will receive.

COME ON, APPLE. GET YOUR ACT TOGETHER AND FIX THIS.



I don't know if it helps:

Configuration Mac Mini M1 2020 with Monitor 2007, DELL E228WFP which believing being the problem, replaced it with a just refurbished one of the same type and then realising that 12.3 caused the for weeks unsolvable problem also on the refurbished Monitor.

I used the the DE-15/HD-15 VGA/SVGA socket on my old-timer and an apple adapter.

Option 1: I changed to the DVI Video socket on the monitor, using a 9 usd adapter bought on the Internet and since then it works again (about one month)

Option 2: join the beta community and you will get 12.4 which may or may not solve the problem for your wait until the update comes as the final version. ( I am not a computer nerd at all)

Patience and good luck.

I think the best thing to do at this time is to call support and open a case. After you do that, you have to keep in touch and contacting them for a solution. The problem is not widespread enough at this point that I doubt it will get addressed at all without anyone who is having an issue calling support.

I got this to work by downgrading my display to TB/DP 1.2. Not ideal, but works fine.

try this: Monterey 12.3.1 external display issue - Apple Community

This issue is fixed in Ventura 13.0.0. Mbp m1p

I have an iMac (Retina 5K, 27-inch, 2020) and I purchased recently a portable monitor Lepow Z1 USB-C and it was working properly with the previous version of macOS. As soon as I upgraded to 12.3, the monitor could not be detected and it shows the "No signal" error. I did all the jobs that were found on the Internet and Apple website like unplugging and plugging again Clearing NVRAM, connecting on the time of turning on, logging in a safe mode, changing the USB-C cable, using the Mac Original Thunderbolt 3 cable and so many other unusual works that somebody said like changing the direction of the cable and so, but no change. I already talked 2 times with Mac support and they still could not fix the problem. The same monitor with the same cable is working with my MacBook which is under the previous macOS version.

It works with some of the USB-C to HDMI adapters but not all. It works with a cheap one which is a no-name random USB-C HDMI adapter but I have another that I purchased more expensive but doesn't work with that.

I just recommend downgrading if you just upgrade it till the moment that a real solution will be there.

Does anyone have a solution?

Same issue here.

I've tried two different monitors (LG and Arzopa), tried HDMI on both, USB-C on one, different ports on my Macbook, and different cables. Some solutions say to switch off Automatic Graphics Switching but my option for that is gone.

My monitors only work if I plug them in during a fresh boot.

My Mac mini ist connected to a TV via HDMI. After upgrading from 12.3 to 12.3.1 my computer does not recognise the TV correctly, i.e. I have a picture but the color profile simply says "Monitor" and I am no longer able to switch the sound output to the TV set. Seems that the HDMI handshake is broken somehow. Very annoying.

It's not just DP though. I've got an old DVI monitor and even that one just says "No Signal" and only rarely actually displays the image after some type of refresh, like waking my Mac Mini from sleep mode or changing the resolution.

I've been in contact with Apple for a while and they even promised to send me an HDMI->USB-C adapter, so I can switch cables around and test the monitor with the HDMI port but I haven't received anything yet. I also talked to multiple reps but nothing's happening (okay, Easter holidays and everything but even before that), they just keep taking the same logs and "my" main rep hasn't contacted me in probably 2 weeks, even though they promised they would.

Same issue, I have two Dell S2421HS monitors for my Personal MacBook Pro (using the HDMI Ports, the DP ports are used for work PC). I have an extra Apple TV A1842 (32GB) plugged my second monitor into the Apple TV > Add Display > Display Settings > Extended Display. Whenever I need the second display it works seamlessly until there is a resolution.

Same. Absolutely maddening.

2021 MacBook M1 + LG 32UP83A-W. Worked great on 12.3. Updating from 12.3 → 12.3.1 broke it. None of the approaches I've seen bring it back. Just crazy. How does this widespread of an issue survive testing? Bonkers.

And to Bormo - This doesn't have anything to do with "Apple being more interested on correct gender speech and diversity" than bug fixes. This isn't zero sum. That's just you polluting a totally unrelated space with your own issues.

I have this same issue. I'm on 12.3.1 and my LG ultrawide monitor stopped being detected. I sent it to LG and they said there was nothing wrong with the monitor. I use it for my work as a software engineer and find this extremely frustrating because my job locks my laptop if it's not on the latest macOS version, for security reasons. Apple needs to put an update to fix this.

Down again !

Today I plugged in a new Thunderbolt Docking Station while everything was running.

Picture was there (Thunderbolt Link), all good. After a reboot, blank screen on external monitoragain.

The MacOS still has a problem.

Switched to DisplayPort (new Dock has DP) and picture was there gain, 5k

So, your mileage will vary depending on many factors and hardware.

What kind of hub do you use?