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

After updating my Mac Mini today to 12.3, my monitor now no longer displays an image via USB-C, just keeps saying on no signal on the monitor.


I have tried HDMI and same issue. The odd occasion it will display a picture but once I shutdown or restart the mac mini it does not display a picture. The mac is booting up. I have had to resort to connecting it to my old TV with HDMI connection.


This is so frustrating


I have tried resetting the SMC which had not appeared to work, also tried downgrading the displayport version from 1.4 to 1.2 (on the odd occasion I did get a picture) but that has not worked either. 


Has anyone else having this issue?


The monitor I use is a BenQ SW270C.


This is really doing my head in and was wondering if anyone else has got a fix to this.


[Re-Titled by Moderator]

Mac mini, macOS 12.2

Posted on Mar 17, 2022 12:48 PM

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248 replies

Oct 19, 2022 11:12 AM in response to cyeoman06

i have the same problem with samsung m7 monitor , can't connect it any more with usb type c cable , i even bought new usb cable from apple, i thought my old cable is broken so now i spent 75 euros for a software issue :( .. only with hdmi which is only 30 fps .. it is really annoying as i do mush videos editing and the programs are quite slow...


hope they come with a new update yo fix this bug

Oct 26, 2022 4:05 AM in response to Jacob (Jakx102)

Upgraded my MB Air M1 to Ventura yesterday. DisplayPort had severe flicker and ghost picture on the LG, TB display was dead.

Networking (EthernetApple Filesharing) also had issues.

Reboot and so on, did not help. Switching to DP 1.2 did not work, black screen.

This morning, plugged all back in, all was back again and TB display works again. So same issue as with previous OS, its not really stable.

Dec 19, 2022 4:01 AM in response to cyeoman06

Has anyone received any helpful advice from support regarding this problem so far?

The last advisor (second level, not the "regular" phone support people) I talked to had me try a lot of things, including a factory reset, but none of it helped. He also filled out some form with me and sent it to the "engineers", later he called to tell me that he'd received a reply from them but I haven't heard from him since then (more than a month ago by now) and I also can't seem to get in contact with him anymore because the supportmessaging link I got just shows some error and the e-mails I send to "acsupportcase" directly go unanswered too.

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

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