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.
This happened for me as well, I have two DELL p2422HE monitors "chained" together, one monitor connected to the other monitor via displayport cable, and then connected to my macbook via one usb-c cable from the first monitor. This used to work perfectly, then I upgraded to monterrey and it no longer works. When I hold down the "option" button in the displays settings in system preferences I see the "detect monitors" button appears, but this does not work either, only one monitor is detected still.
12.3.1 also didn't solve the issue for me.
updating to 12.3.1 did not solve the issue.
Holding the option button on displays does not show the "detect displays" kinda frustrating since my line of work needs multiple displays....
12.3.1 also didn't solve the issue for me. I work around this issue by using the usb c port and hdmi port. I hope Apple fixes it ASAP!
Same issue macbook pro 2019 monterrey beta 12.4 .... wtf???
I can't figure out, I try everything, holding option key, sleep mode, save mode, reinstall monterrey.... and the "add display" appears and disappears from one moment to the next... what the hell??? I have a mac 16" 2019
12.3.1 update did nothing too resolve this issue for me. My workaround is not particularly elegant but... Mac mini with Lenovo 27" plugged in via USB-C, designated as 2nd monitor (no menubar) - first monitor LG 4k 27" plugged in via HDMI—at startup I have to unplug the 2nd Lenovo first, then startup... wait for the mac to boot up, then connect the USB-C plug for the 2nd Lenovo monitor. If I try to boot up with both monitors plugged in, only the 2nd Lenovo monitor shows up but of course no menubar, and the other monitor is black, and doesn't appear connected. No other sequence of steps works, and I've tried everything. This has worked for the past 3 weeks, but now I have to hard stop the first boot up because nothing happens until I re-boot after a hard stop to get that first monitor to show!!!
Any idea how I can get this info to Apple?
This solved it for me: Go to System Preferences > Battery > Battery or Power Adapter. Deselect “Automatic graphics switching”, restart the Mac.
I have the same problem, using original Apple 24" expensive displays - why is Apple hiding such a significant problem - I am really disappointed with you guys :( - The problem has existed for more than SIX months !!!!!!
Just updated to Montery 12.4 and still have the same issue. External monitor not recognized-no display options to find in preferences. Need apple to weigh in on this. I have a 2015 macbook pro connected to an external monitor with thunderbolt and hdmi. neither work.
I use a Mac mini 2018 intel for design work. After updating to Monterey 12.3.1 I lost use of my 2nd display that is connected via HDMI cable. The display connected by USBc does still work. I switched the wires and the same thing, only USBc connection worked. It is not a problem with the monitors it is caused by the upgrade. I spent multiple days talking to multiple apple support advisors, even the ones at the highest level and no one was able to fix this problem.
If you are able, downgrade to Catalina. I was able to do this by backing up my computer first on an external hard drive. Then deleting the hard drive so it reverts to manufacturing settings. I was on MacOS Mojave 10.14.6 and the problem goes away. Then I upgraded to Catalina and my 2 displays were still connecting. My mistake was upgrading to Big Sur like the apple supporter advised me to do. Once I upgraded to Big Sur my 2nd display was not connecting again. This was the original problem. I figured I can go back and repeat my steps and stop at Catalina, but for some reason (no one could help) I was not able to. I kept only getting the option to download Monterey which was the original OS that caused the problem. So I am stuck only using only one display.
The only advise I was given was to talk to the manufacturer of the displays to see if there are any updates to the drivers available. That's right, blame it on the displays that aren't mac.
Are Apple developers at least aware of the issue? This bug seems to affect many users and the impact is pretty significant. I don't understand why this hasn't been fixed for 3 minor version upgrades (for half a year).
TLDR: Try connecting to a variety your TVs? Seemed to fix the issue for me.
I just updated my 2017 MacBook to 12.4 Monterey last night (May 20, 2022). I thought that I had waited long enough for Apple to work out all kinks, but I immediately had no ability to detect my second monitor, which brought me to this thread here.
I went through the basic troubleshooting steps and was incredibly frustrated because one of the simplest options mentioned didn't even work (hit the option key to switch the Night Mode button to Detect Displays).
As an additional step I decided to try connecting to one of our newer smart TVs. Although the USB-C to HDMI cable didn't work, I was able to connect with AirPlay.
I decided that before I unload I bunch of money on a new monitor that can use AirPlay, I thought I'd try connecting to my oldest TV (15 year old Sony with an HDMI port but no wifi or bluetooth) and maybe move it into my office if it worked. OMG, now the HDMI cable is working! I took it back to the original monitor and BAM! Connected with no problem.
So, I have no idea why this worked, but it did.
I had this issue suddenly start after using Monterey for a couple of months. The Dell USB-C monitor couldn't detect the source, although all of the USB ports were working. The only thing that solved this for me was to remove the power cable (physically) from the monitor and reattach
None of the solutions I've read here work for the 2022 Macbook Air. The first monitor plugged in wins, regardless of which of the two ports is used. Detect monitors, powering on and off, sleeping and restarting, none of those make a difference.