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.



Was having same issue. Macbook pro 12.3.1 with LG monitor.

Thanks to everyone for suggestions - which i tried.

I tried the unplugging it and cable as suggested - didn't make difference.

I tried the Reset on the monitor - didn't make difference

But then i just unplugged the cable from macbook to monitor again and it worked. So i would suggest trying what i did and if you don't see it right away, try the cables again etc. Might work.

The problem with a factory reset is that you need an image to actually get into the menu (at least on my monitor).

I've tried everything: Unplug while running, unplug while not running, leave it unplugged for a while, plug in while running, turn on before switching on the Mac Mini, turn on once there's an image on the main monitor,... - nothing helped, apart from using the official adapter. And please, don't spend money on that adapter, call support, so they can send it to you to test (if you haven't yet, of course) - maybe that'll make them more interested in this problem.

This is the exact same system kernel panic, 1-2 seconds frozen, then pink screen flash, and crash that we had to deal with when the M1Pro and M1Max chipset systems launched. It plagued my 16" MBP multiple times PER DAY.

I upgraded earlier today, and within a few hours; the entire system has kernel panic diseased code that was fixed many releases ago; and somehow its back.

APPLE; I want to downgrade the OS back to the previous release IMMEDIATELY; this is so embarrassing for you. What, like two lines of patch notes for 12.3.1, that just crashes the core processes; you brought back the kernel panic issue; like how does this make it out of QA??

I have the same issue as others.

Running 12.3.1

Displayport via a USB-C connection on a CalDigit docking station.

Monitor HP E273q

Works fine on HDMI. Is not recognised on display port.

Cables all checked,

everything power cycled multiple times.

Monitor factory reset (is on DP 14.)

SMC and NVRAM reset

New CalDigit dock tried.

Apple case opened .

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.

Same Issue

The monitor suddenly turns off for a few seconds every 10 minutes or so.

MacBook Pro (13 in, M1, 2020)

Apple M1

8 GB

MacOS Monterey 12.3.1 (21E258)

Samsung monitor:

LU32R591CWRXEN

S/N: CXK1H4ZR100221V

I've benn triying with HDMI 1.4 and 2.0, and DP 1.1 and 1.2, and 30Hz, 25Hz, and 24Hz, but nothing works

Same issues on my end too. How is this not already fixed? It feels like it never will be fixed. Nothing helps. Not reaching out to apple reps since they haven’t been able to fix it, not reporting it as a bug nothing. I expect to read about a class action lawsuit soon. Shame on Apple indeed.

What cables/adapters are you using to connect you monitors?

Did you already ask them to send you the official USB-C AV multiport adapter to try (for free, of course)? It's an HDMI->USB-C adapter and no idea why but my second monitor works with that one, even though it requires converter cables to connect both of my monitors if I'm using it, so it's only a temporary fix for me while I'm still waiting for them to fix this, so I can finally use my regular adapter with just regular cables again.

I had the same problem. After updating to 12.3.1, my external monitor that I have been using since 2018 no longer worked. I found an article(https://www.howtoisolve.com/fix-mac-second-monitor-issue/) that helped. After turning off Automatic Graphics Switching, rebooting, and then plugging my monitor back in, my monitor was detected.

Hi - My external monitor Dell P2217H stopped working. I thought it was monitor issue, and went and bought new Samsung 'curved' display, since the Dell was from 2016..(found an excuse to get a new one). The New monitor a Samsung CRG5 (LC24RG50FQNXZA) started flickering as well. So I had to return it. Apple has to fix the external monitor issue.

Hi,

I was able to get it to work with my old monitor. I got the clue from this email thread. Instead of connecting the HDMI cable from the external Display into HDMI interface of my Dongle (it is multi-purpose - SD Card reader, USB Port, Network Port, Power), I got a new HDMI - USB-C cable from Amazon. I connected it directly from External Dell HDMI display to one of the USB Ports of MAC. Again this is a new HDMI -> USB-C cable, not the old HDMI -> HDMI cable. The Mac OS is Monterey 12.4. So it is now working in Extended Display mode. Hope someone will find help with this information. B083Z8QBJ5

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.

@emmanuel-0_0, the most current version is 12.4 and includes fixes for the monitor issue. I had to reset my second display to factory settings and after that it has worked normally. Because it was not working I could not access the menu until I connected it to an older MacBook on Catalina I have laying around. Once connected, I reset to factory and works great now. If you can reset your monitor and update to 12.4 you might have better luck.

This didn't work for me. I have both an M1 Macbook Pro on 12.4 and an Intel 16in Macbook Pro on 12.3.1 and neither laptop detects my LG 35WN75C-B monitor. I sent it back to LG and they said there was nothing wrong with the monitor too.