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I am trying to use a mid-2011 iMac (running High Sierra 10.13) as target display for a 2018 MacBook Pro using Thunderbolt to USB-C. Using cmnd-F2 as instructed, nothing happens. I am using a third party keyboard, but even when I use a Mac wireless keyboard, I get nothing.
Suggestions?
MacBook Pro
Use your iMac as a display with Target Display Mode - Apple Support
The 21.5" 2011 iMac should work. You need a Thunderbolt-3 adapter
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple
and a Thunderbolt cable
Apple Thunderbolt Cable (0.5 m) - White - Apple
Everything must be Thunderbolt, no USB.
Use your iMac as a display with Target Display Mode - Apple Support
The 21.5" 2011 iMac should work. You need a Thunderbolt-3 adapter
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple
and a Thunderbolt cable
Apple Thunderbolt Cable (0.5 m) - White - Apple
Everything must be Thunderbolt, no USB.
What size display is the 2011?
That is the problem, it needs to be a 27”.
Argh - why? And why doesn't it say that anywhere???
That is a question for Apple.
iMac as target display not connecting to MacBook Pro
