My thuderbolt display is 3 weeks old which I'm using as display for my mac mini. I no longer get the display on but can hear the sound. Please suggest.

My thuderbolt display is 3 weeks old which I'm using as display for my mac mini. I no longer get the display on but can hear the sound. Please suggest.

Make sure the mini-displayport/TB plug is fully seated.  It may look fully plugged in but isn't.
Make sure the Displays system preferences has an Arrangement tab.  No Arrangement means the monitor is not being detected.
Do a smc reset.
If none of this works I suggest you take it back to apple (along with your mini).

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