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

Continue testing everything I have. Unfortunately do not have a single monitor that supports DP1.4, only DP1.1 and DP1.2. Absolutely useless now. Both Mac pro 2013 and Mac mini 2018 are now paperweight. Now thinking on how I can roll them back to big sur or at least 12.2.1…

Absolutely disappointed! Keeping all the rest of our macs in the office without updates for now.

[Edited by Moderator]

"After installing macOS Monterey, choose System Preferences from the Apple

menu , then click Software Update to check for the latest updates."

• Update macOS on Mac - Apple Support

//support.apple.com/en-us/HT201541

Some MacBook Pro models cannot see the update. Perhaps this

varies, due to hardware differences between build-model years.

• If an error occurred while updating or installing macOS - Apple Support

//support.apple.com/en-us/HT212526

[Page URLs could be loading slower today, depending on region.]

Same here,

Issue resolved with recent update 12.3.1 MacBook Pro 16", 2019 with hp U32 4K HDR monitor.

Resolution up to 3840x2160 is working fine.

But nevertheless, apple made a fool of itself with it. This bug was known or untested. No quality assurance. That's amateurish.

OMG: after update 12.3.1 my vintage monitor dell E228WFP working perfect since I bought the mac mini, is now useless.

I have been an owner of about 15 apple mac book, imac. ,mac mini and iPhones , tablets over the years: its the first time I think about changing everything to windows.

after 12.3.1 it fixed my HP U32 4K - connection DP -> USB-C with old cable continues to work as before.

for some reason dp -> dp between hub and monitor and usb-c -> usb-c between mbp 16 and hub - still doesnt work.

Update done, not good.

Now the black screen witch the LG monitor seems solved, the mac boots and i am able to login.

But … My external disks don’t come online, i see my desktop, can move the mouse but cant start anything, no finder window.

Will call Apple Support again …

Still not resolved for me. My monitor seems to be recognized by my Macmini again but now HDR options are not consistent across the USB-C ports. After working on the computer and having it sleep when I woke it back up it went to a blank black screen. That required me to unplug and replug it in only to then experience the lack of HDR content.

After updating to 12.3.1 there no signal from my Macbook (Early 2016). My old Dell P2719HC worked fine with 12.3. After the current update theres no signal at all. I've tried everything (disconnecting, power off etc.) but nothing works for me. Please fix this, Apple!

I just installed 12.3.1. on my Mac Mini 2020. The changelog only mentions the Mac Mini 2018 and my second monitor that's connected via a DVI -> USB-C adapter still says "No Signal" after a restart, even though Monterey still lists it in the "Display" settings and I can still move the mouse cursor to it. My main HDMI->HDMI monitor is still working fine. Ffs Apple, get your s...tuff together!

If both your secondary monitor and your Mac power cable are connected to the USB HUB then to your Mac, and your secondary monitor is NOT working and your machine's power source is Battery, try this:

1. Unplug your USB HUB
2. Unplug the power source cable from the USB HUB
3. Connect the power source cable to any USB Type C port on your machine - you should notice that your machine is now charging and is connected to the power adapter
4. Connect the USB HUB to another USB Type C port on your machine - you should notice your secondary monitor now turning ON
5. (Optional) Unplug the power source and connect it back to the USB HUB - I did this because I like my wirings clean looking :)

This is my first time encountering an issue with my Apply machine after an upgrade, and I am disappointed that Apple does not have any direct source of solution for an obvious bug.

My portable monitor on MacBook Pro connected via USB-c is still not working properly. It fades light to dark and blacks out at random times. I have an open ticket still but no solution and no responses to my follow up emails.

I had a very helpful & competent APPLE 🍎 supporter doing this together with me with a lot of patienece, the screen came back after the process described by you. I said I don’t believe it 😵And see, it went to sleep after about 2‘. He asked me if I would prefer to work wit a supervisor or wait for an update…. I chose the later and hope it gets solved with 12.3.2🙏🏻 However he tried everything. In 🍎 I trust. Thanks for the time invested 🙏🏻

I tried it - thanks - didn't work. I have the same issue, MacPro 2018 - 15.6" FHD 1080P + Touch - N1F PRO. This has got to be fixed soonere than later, a huge ripple in the. remote work industry....com on Apple, can we get a fix before the week is out?

kristel147, I can only hope your plea is answered. I have been down for a month now for my second monitor and it is having a profound impact on my ability to work. After the .3 update my monitor now only kinda works. It does sometimes display properly then all throughout the day it dims to where I can barely see what it on it, then gets bright, then blacks out completely and continues to behave like that all day long. The wait for a fix on such a simple peripheral is tiring.

I am beyond frustrated that this problem has been going on for over a month. We have a brand new MacBook Air with Monterey iOS 12.3.1 already installed. When we have tried to make it work with literally every monitor in the office (all LG 27UD88-W), the same black out problem occurs. We have had IT on it all week. It is completely random as to when the monitor will work and when it won't. FIX THIS NOW, APPLE. HOW HAVE YOU NOT FIXED THIS YET? It is clearly happening with all monitors, not just LGs. This is profoundly impacting our ability to work. I have been a loyal Apple customer for over 15 years but for the first time, I am actually considering moving us to PCs. I resent Apple's proprietary issues, as this is certainly not the first time, nor will it be the last, that a non-Apple product won't work with an Apple product. I AM SO MAD.