Unable to connect Apple Thunderbold Display to M4 Mac Mini 2024

As a user, I can confirm TB display, with the correct adapter (I have been working on TB displays, over 1 dozen) - it WILL work on TB 4 and TB 3 protocol.

Again, the non-function TB display can be the 1. cable or 2. Logic board and rarely 3. power supply.

Most of people experienced - such as TB display worked on such as 2015 machine (equipped with TB 2) but NOT working on TB3 device - once more, likely from the fluctuation of signal that MacOS will shut it off - the old connector/Octopus cable problem.

Quick and easy work around has been mentioned here - see the link at the end.

However, I want to put this into contend as user.

Please refer to the screen shots below:

A. I connected the TB Display behind the OWC TB3 Hub

B. I connected the TB Display direct to TB 4 equipped MacBook Pro

Both setups worked - plus I can daisy-chain both TB Displays with this MacBook Pro.

In addition, these kind of set-ups work on TB 4 Hub (both OWC Thunderbolt 4 dock and Caldigit TS4 dock).

In my experience, TB displays (I have tried over 1 dozen of them and 100% rate) with right adapter, will work on TB 3 and TB 4 Mac devices.

But the variables can be a daunting tasks if involved logic board and power supply (hope it's not your case).

For cable issues, should be an easy exploration.

see this link: Thunderbolt Display to USB-C - Apple Community