Mac Mini has Distorted audio over HDMI

My brand new mid-2010 Mac Mini has distorted audio over HDMI. Ideas? Tried multiple connections, devices, but the Mini's audio flattens and distorts high pitch sounds. Really distracting, makes movie watching impossible. Thinking about returning it.

Update: After a bunch of playing around, it appears that I do, in fact, have audio output. What is missing are the up and down volume chirps. I can do without that.
Now, anyone know how to fix the Logitec webcam's input volume...?

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