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I have two old thunderbolt displays that I've used for the last 5 years with my iMac Pro. I had to purchase adapters but they've always worked. I just purchased a brand new Mac mini and although the machine shows my monitor on the displays panel inside the settings, the monitor is black with no picture. Did you have this problem when you first connected yours or did they just start right up?
 
I have two old thunderbolt displays that I've used for the last 5 years with my iMac Pro. I had to purchase adapters but they've always worked. I just purchased a brand new Mac mini and although the machine shows my monitor on the displays panel inside the settings, the monitor is black with no picture. Did you have this problem when you first connected yours or did they just start right up?
Mine just showed up and worked perfectly
 
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