Since the last update (21A5534d), my MacBook doesn't detect my 2nd display. I've tried swapping the display with a new one and trying different connection methods. My MacBook's built-in display goes black for a moment when I attach the cable, but nothing else happens.
I seem to remember that the System Preferences > Displays used to have an option for manually detecting a display, but it doesn't appear to be there any more.
I hope I'm not the only person experiencing this.
I just upgraded to Monterey and lost use of my second screen. Tried everything said here as well as in Apple support. On a whim, while in the display settings I dragged the uncooperative screen to the left side and it works! At least I can move my mouse back and forth and the dock moved left. Windows open using either screen now. The only thing is that I didn't have the same picture so went back to select it. I'm really hoping it will continue to work this way.
Thanks @balFalcon! I’ve just unplugged the connection cable and reboot my MacBook. After it’s done, I plugged it back and it can detect automatically.
One more with this issue-- my HP monitor suddenly doesn't work with Monterey, and the Detect Displays button doesn't appear in Preferences>Displays when I press or hold Option. If holding option to get the Detect Displays button was removed for Monterey, they should have removed it from the Monterey macOS User Guide as well; it's still active, according to the ? button.
Several responses below suggest to power off and on your external monitor (whilst still plugged in to the Mac). Worked for me, but not guaranteed...
I have the same issue with my MacBook 13' and my LG 27' monitor! I am on Monterey and my MacBook is not recognizing the external display at all. Can anyone from @apple answer us please!!!
Same here. Only it is intermittent. 1 time out of 10 it actually connects. The screen sees something as it auto-selects the correct HDMI port, then it all goes black.
So frustrating ... same issue after upgrading to Monterey ... this seems like a major mistake? @apple?
Really frustrating @apple -- external monitors do not connect consistently or at all at times.
Well, personally "I hope you are the only person experiencing this" :-) But clearly no.
The displays control panel... It's wrecked. Not only is the detect-displays button just completely gone ("who needs this?" -Apple Intern) but go ahead once you manage to get the displays working and try to arrange them. Variously the Arrange panel, which I think has been flawless since Mac OS 6 ... Doesn't register your mouse clicks and if it does it may half-draw the screens. I quit and relaunched system preferences several times to no avail to try to make this basic part of the system work again. For years Apple was way ahead of microsoft on display management... and now we're back to the stone age.
Thanks for the suggestion on unplugging the monitor. No dice. Randomly I can get it working. It's likely timing related, but the code at this point is completely unstable.
I've got the same with a 2020 MBP M1 and Samsung external monitor. I've fixed it by unplugging all cables from Mac and rebooting screen and Mac. By which i mean... not just turn off the screen with the button on the screen, but really pull the plug out of the wall. then reboot mac, then plug in screen power, let screen come on and plug into Mac. Some posters on other sites are saying that you have to use mac power supply for the mac... but I always have that and my external screen is also plugged into mains power. Good luck...
MBP 2015. Detection of external monitor on DisplayPort still broken with latest 12.1 beta 4 (21C5045a). HDMI works.
Problem still persists, the monitor appears in the screen settings after 8 seconds, says it was disconnected. I believe that Apple developers should only use iMac to not solve this problem of hubs for external monitors, if they used that and were with the same problem it would come out in the first fix. Problem still persists in 12.1 beta 4 (21C5045a)
I haven't upgraded to Monterey yet (because of all the issues) but there is a free app on the Mac App Store called Display Menu that has the missing "Detect Displays" menu item. I've used it for years and can highly recommend it. I have no relationship with Display Menu except as a satisfied customer.
I have the same issue using a macbookpro (2020), use 2 displays since the update to monterey no longer detects one of displays. I have another machine also macbookpro (OS bigSur) and detects the 2 displays when I plug it to the same set up: startech hub usb c. This is extremely annoying :/
I have the same issue using a macbookpro (2020), use 2 displays since the update to monterey no longer detects one of displays. I have another machine also macbookpro (OS bigSur) and detects the 2 displays when I plug it to the same set up: startech hub usb c. This is extremely annoying :/