Sounds like you have the ability to do audio through HDMI. Now all you need to do is some sleuthing to find the setting that is preventing this.

This is probably a silly question, but is the Nvidia HDMI out selected as the default? Also look at your windows audio settings to see what is in there.

Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!