New iMac running on Monterey 12.2.1
Cannot detect second monitor. Help says to hold down option key while in displays (system prefs) and Night Shift will toggle to Detect Displays. Not working
What USB-C/Thunderbolt 3 to DVI adapter?
First I would make sure the monitor is set to DVI.
Then I would test that adapter plugged into a different port on the iMac
Lastly I would test a different USB-C/TB3 to DVI adapter that states it is Mac compatible.
https://www.amazon.com/Thunderbolt-Adapter-Convertehttps://www.monoprice.com/product?
What USB-C/Thunderbolt 3 to DVI adapter?
First I would make sure the monitor is set to DVI.
Then I would test that adapter plugged into a different port on the iMac
Lastly I would test a different USB-C/TB3 to DVI adapter that states it is Mac compatible.
https://www.amazon.com/Thunderbolt-Adapter-Convertehttps://www.monoprice.com/product?
This is Apple's user to user forum and Apple does not oficcally respond here.
Have you tried a different adapter cable, or an adapter and DVI cable like I suggested above?
What external display and how is it connected to the iMac?
(make, model, adapter, cable, etc...)
also see > Connect an external display to your iMac - Apple Support
This is the adaptor that we are using:
https://www.amazon.ca/CableCreation-Compatible-Macbook-Chromebook-Thunderbolt/dp/B015RIVZY4/ref=sr_1_2_sspa?gclid=EAIaIQobChMIlKij8IaW9gIVCT6tBh1v2gV_EAAYASAAEgLDOvD_BwE&hvadid=356312927962&hvdev=c&hvlocphy=9000827&hvnetw=g&hvqmt=e&hvrand=8280985373257493933&hvtargid=kwd-342277951648&hydadcr=25137_10268438&keywords=thunderbolt+3+to+dvi+cable&qid=1646226172&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzUlRGSDJaQVBJQUg0JmVuY3J5cHRlZElkPUEwOTkyOTM5MklTQjFYWVJVVzUzUyZlbmNyeXB0ZWRBZElkPUEwODU2NTY1NkU3UFpEWDFEWTZKJndpZGdldE5hbWU9c3BfYXRmJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ==
I tested the monitor on an older iMac and it worked fine. It is connected but it flickers on and off, mostly off.
Thanks
John
No response from "Apple Support". Everyone on March break???? FIX THE PROBLEM! The very least you could do is respond with "We know this is an issue and we are working on an update." Terrible service.
NEC Model LCD2090UXiR
thunderbolt 3 to dvi adapter
Still unable to get my second monitor working. It flashes on and off. Cable is mac compatible.
new 27" iMac cannot detect second monitor. Option key does not bring up detect display in system preferences.
