connecting 27 LED cinema display to new iMac
I am trying to connect my 27" display to new iMac Pro, I have the Thunderbolt 3 to 2 adapter, have it and the USB plugged in to the back of iMac but not working. Please advise....
iMac Pro, macOS 10.14
That Thunderbolt won't work with non-Thunderbolt displays.
Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple
"Note: This adapter does not support DisplayPort displays like the Apple LED Cinema Display or third-party DisplayPort and Mini DisplayPort displays."
About the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter - Apple Support
"This adapter is not compatible with displays that use DisplayPort or Mini DisplayPort, such as the Apple LED Cinema Display."
You need a USB-C to Mini DisplayPort adapter.