690G HDMI via tv problem

Hi, I recently built a new media center pc using the 690G chipset. But I have a few problems when using the HDMI port sending A/V to the 19" 720P TV I'm using at the moment. I'm using windows XP Pro SP2 and the newest ATi video & Realtek audio drivers but I cant see how to play sound via the HDMI port on my tv.
The other problem I have is the video on the screen is in wide screen and I can only change on my tv between letter box .etc. (my tv has no Manuel display size options) is their any way to make the picture take up the whole screen via catalyst control center .etc??? Thanks in advance :)
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