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I have an old late 2012 aapl imac version 10.14.6 (21.5 inch, late 2012)... I want to use that monitor as a second display... what cords / displays ports would be best to hook up to my macbook pro (MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports). I am already using one connection to a ViewSonic display. Thx!
Use your iMac as a display with target display mode - Apple Support
You will need the Thunderbolt 3 adapter and Thunderbolt cable.
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple
Apple Thunderbolt Cable (2.0 m) - White - Apple
You will need to erase the iMac and install High Sierra (10.13)
Use your iMac as a display with target display mode - Apple Support
You will need the Thunderbolt 3 adapter and Thunderbolt cable.
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple
Apple Thunderbolt Cable (2.0 m) - White - Apple
You will need to erase the iMac and install High Sierra (10.13)
Sorry but you are wasting your time, 21.5" models will not work in Target Display mode. Nope, no work arounds either.
display help connectivity fir dual monitors
