I have a 2013 mac pro and the volume keys aren't changing the volume of my LED display. The icon shows up as going up or down but the volume seems to not adjust.

I've had this computer since october of 2013 or so and I have just recently run into this problem. I use the volume keys on the keyboard and I hear the tick sounds and it shows that its going up and down but the volume doesn't actually change. I've looked in the "sound" settings and everythings seems to be correct... I can't adjust the sound in their either though. I pay too much to be having an issue like this.

Possible? Yes. Likely? I'm not sure.
In my house, I would suspect that either one of our pets chewed on a cable or dislodged a connector, or somebody bumped a connection loose, but then I would expect either no volume at all or hum from a grounding problem. Clear, non-zero constant volume is harder to explain.
You say adjusting the output volume directly in the Sound settings or on the menu bar also has no effect on the audible output?
You might want to go ahead and answer the question about connections. Somebody else might come along who recognizes a possible problem with the particular combination you are using. I don't have exactly your model of Mac Pro or display. (Is yours the Apple LED Cinema Display? Which size?)

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===============
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I have a 2013 mac pro and the volume keys aren't changing the volume of my LED display. The icon shows up as going up or down but the volume seems to not adjust.

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