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The computer is the older edition of the Mac Pro which was the small cylinder.
Mac Pro, macOS 10.14
Can you be more specific? Did the set up work before? or a new set up?
I believe your Mac Pro (cylinder) might be 2013 Mac Pro (aka Trash Can) - which equips with TB 2 connector.
Not sure about your model but it must have TB port #2 or #3 (with adapter) to work.
Yes but he computer and display were indeed connected before without a problem. I can tell you that the display is now working with the computer.
Apple 27 inch Thunderbolt Display does not turn on when computer starts
