I currently have an HTPC connected to my home theater receiver via its AMD graphics card's HDMI connection. From time to time, I would like to use the HTPC as a source for playing music, but I don't ...

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This is an AV issue, but looks to be Mac-specific, so posting here rather than in the A/V Club. Sorry for the length, but I'm trying to supply all relevant info) Summary: I have an MBP connected via ...