24" LED DISPLAY NO MIC OR INPUT

Hello
I cannot for the life of me get the mic working on my LED display. It did work and then stopped. I have tried unplugging display, restarting, deleting preferences.... just cannot get any input.

If the issue continues with other machines, then the culprit must be the display. If the microphone input works with other machines, then the issue is with the computer itself (or its OS).
Good luck

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