Strange mac mini sound issue with HDMI cable

I connected my mac mini to my Panasonic 44 inch HDTV with a DVI to HDMI adapter. I didin't get sound through the cable like i expected. Then I connected a 3mm to RCA jacks adapter to the analog HDMI port on the TV and still no sound. Strangely, when i switched resolutions from 1920 X 1080 to 1200 X 720 the sound started working through the audio ports. It works on every resolution except 1920 X 1080. Any ideas why this is so? Or how to fix it?

First off, the DVI standard makes no provision for carrying sound. That is why you didn't hear any sound when making a DVI-to-HDMI connection from your mini to your TV through the adapter. I am assuming there must be a setting on your TV that is snuffing the sound input from the mini rather than the mini not outputing sound at 1920x1080. This would be easy to prove. Just pull the audio minijack connector from the mini's sound out and I'm guessing you will hear sound coming from the mini's speaker.
Is it possible that, on your TV set, you have associated 1920x1080 with an expectation of HDMI input? Maybe the TV is expecting to find digital audio over the HDMI input and somehow that association is only with that one resolution. Then when you drop resolutions it is looking for sound over the analog port instead of over the HDMI port. I'm just guessing here, but it's something you can check.

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