Can't control volume on LED Cinema Display from keyboard

I have a LED Cinema Display attached to my Mac Mini. The volume control buttons on the keyboard don't work anymore. The only way I can change the volume is to use the volume control on the video I am watching. I tried the headset trick on the output port on the Mini, and now that works with the volume keys. But, the display volume is still not working. Any hints?

The reason why that has happened in the first place is because MAC OS, is programed to not adjust the volume through an HDMI interface. If you have the volume control shown on the upper bar like i do, it appears light grey.When you click on it you cannot move it up or down. This is of course what the keyboard controles for volume. It does not control the program.

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