Apple Thunderbolt 27 display to MacMini connect problem

SteamX wrote:

I tried to connect Thunderbolt 27 display to Mac Mini using these adapters:

USB-C to Thunderbolt 2;

MiniDisplayPort to HDMI UGREEN;

MiniDisplayPort to HDMI DEXP;

It's always stay black and did not responding. I checked monitor using old MacBook Pro and cable - it's working. Checked HDMI adapters with same notebook and it's also working.

Any idea why this happened and how to fix?

If this is an 27" Apple Thunderbolt Display (model A1407), whose hydra cable has two heads, it sounds like the problem is that you used the wrong adapters.

This display requires Thunderbolt input – so the the appropriate adapter is the Apple Thunderbolt 3 (USB-C) to Thunderbolt 2 Adapter .

I am guessing that your "USB-C to Thunderbolt 2" adapter is really a USB-C to Mini DisplayPort adapter, and so while the physical connectors would fit, it would produce the wrong type of signal. With the two adapters you're calling "Mini DisplayPort to HDMI" adapters, not only is Mini DisplayPort the wrong signal type, but I suspect that the adapters are one-way, meant to take Mini DisplayPort output from a computer and to convert it to HDIM for a monitor. With the HDMI end plugged into the Mini, they wouldn't work even to hook up a Mini DisplayPort display.

The all in one (octopus) cable is known to go bad. Connect a TB2 cable directly to one of the TB ports on the display bypassing the octopus cable. You Mac Mini needs to have a working TB port to work.

Did you use Apple's adapter ?

If Thunderbolt 1/2 works with old MacBook Pro -- you might want to try a different adapter.