This is a follow-up to my earlier post complaining of a "dim" picture from the component outputs of this motherboard...
So after weeks of trying to tweak the various settings, trying older and beta versions of the nVidia drivers, etc., I gave up and decided to try a video card. I bought an nVidia 6600GT based card. It's like someone turned a light-switch on. The difference in output levels is huge. In terms of "vibrance" (for lack of a better word), the HTPC now far exceeds either of my two DVD players (Sony DVP-S7000 and Pioneer DV-563A), and the HTPC is now producing a fantastic picture.
It is probably worth noting that during my many hours of trying to resolve the issue, I did find out that the output levels of the motherboard video are fine until any version of the nVidia drivers are installed. With just the Win XP VGA drivers installed, vibrance is fine (albeit at 640x480). As soon as the drivers are installed, the output level drops considerably (even at 640x480). To me, the problem is how the drivers are interacting with this motherboards implementation of the 6150 chipset.