Having trouble using my 2019 iMac 21.5" as an external monitor for my MacBook Air M1. Devices are connected via Thunderbolt 3 cable. Macbook air won't detect secondary monitor although charging works. Thanks in advance for any help.
Unfortunately, your setup will not work to use your 2019 iMac 21.5" as an external monitor. What you are attempting to do is called using the Target Display Mode. Target Display Mode isn’t supported on iMac models with Retina display. Only iMac (27-inch, Late 2009), iMac (27-inch, Mid 2010), and iMac (Mid 2011 to Mid 2014) support Target Display Mode.
Axel F.
Unfortunately, your setup will not work to use your 2019 iMac 21.5" as an external monitor. What you are attempting to do is called using the Target Display Mode. Target Display Mode isn’t supported on iMac models with Retina display. Only iMac (27-inch, Late 2009), iMac (27-inch, Mid 2010), and iMac (Mid 2011 to Mid 2014) support Target Display Mode.
Axel F.
A 2019 iMac is not an 'external monitor'.
You can't do that.
Thanks for the quick response.
You are welcome.
Axel F.
Unable to connect secondary monitor (2019 iMac) to my new MacBook Air M1
