Can anyone help??
I've just moved to macOS Sequoia 15.3
Now my second display (thunderbolt) which worked perfectly, about 2 hours ago is now dead and cant be detected. I've looked on line and it turns out it's a common problem. I wish I had just left the upgradfe.
IS there a fix?
Thank you
iMac 27″, macOS 15.3
Before the latest update to 15.5, I was able to fix this problem by running:
sudo rm /Library/Preferences/com.apple.windowserver.displays.plist
However, this doesn't work any more. With the help of ChatGPT I used the search described elsewhere in this thread :
sudo find / -name "*windowserver*" 2>/dev/null | tee ~/Desktop/windowserver_files.txt
The suggestion from the AI was to run:
sudo rm -f /Library/Preferences/com.apple.windowserver.displays.plist \
/System/Volumes/Data/Library/Preferences/com.apple.windowserver.displays.plist \
~/Library/Preferences/ByHost/com.apple.windowserver.displays*.plist \
~/Library/Containers/*/Data/Library/Preferences/ByHost/com.apple.windowserver.displays*.plist \
GPT: "Yes, it’s very likely macOS now references or prioritizes:
Then shutdown:
sudo shutdown -r now
This worked for me. It looks like the displays.plist is now in a different location after the update, but I haven't bothered to work out exactly where yet. - This narrows it down a bit though. I hope this helps someone else, it's a really frustrating problem that has cost me a few days work over the last year.
I just encountered this issue when updated to 15.6 I'm in the same boat as you, it is crucial for work. Did you get anything to work?
That's it, this is the only trick that worked for me, external monitor is detected again. Thank you !
Did you ever get your monitor to work? I'm having this same problem and I have the LG monitor
I tried it, the display (LG projector) still not detected.
I'm also using a Thunderbolt to HDMI adapter, and I have tried plugging it into a different Thunderbolt port, but the display remains undetected.
This solution worked for me, it was working fine then suddenly stopped. I installed the app reccommended.
I tried using the suggested App (Display Menu), unfortunately it didn't work either.
Mac zbiera moje dane z iphona
macOS Sequoia 15.3 wont let me detect my second display
