No guarantee I'm correct on this, but I thought the 6600GT wasn't HD compliant. It was made before the jump to HD in many Nvidia cards... Then again, maybe you need to update the video drivers.
Now that I see the specs though, there is HD support, so that rules out #1 above.
There may be a chance you need to set a custom resolution in the Nvidia Control Panel. It'll be right there as soon as you open the utility. That way, you can set the highest resolution your TV and card are caable of, hopefully with no nasty side effects. Even then, it cancels out the new resolution in 15 seconds if it doesn't show up right, or at all.
EDIT: It could also be that VGA doesn't support resolutions that high... I just wiki'd it and it's saying even SVGA is 800x600.
EDIT 2: Scratch that. Another wiki age say max VGA res is 2048x1536...
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