Can I use iMac (2012) in a target display mode from my new iMac (2019) with USBC-miniDP cable?
The 2012 doesn't switch to the mode with Command+F2.
It works when I use Thunderbolt cable and MacBook as the source.
iMac 27", macOS 10.14
Use your iMac as a display with Target Display Mode - Apple Support
You need a Thunderbolt adapter
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple
and a Thunderbolt cable
Apple Thunderbolt Cable (2.0 m) - White - Apple
The connection has to be all Thunderbolt. No Mini DisplayPort or USB.
Use your iMac as a display with Target Display Mode - Apple Support
You need a Thunderbolt adapter
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple
and a Thunderbolt cable
Apple Thunderbolt Cable (2.0 m) - White - Apple
The connection has to be all Thunderbolt. No Mini DisplayPort or USB.
Target Display Mode
