Okay, okay calm down, take a deep breath.
Now, I'm not an expert, but I may be able to help a little. First, did you read Karnis's guide to Powerstrip settings? If not, here's a link:
The next thing is that you weren't completely specific as to how the htpc is hooked up to the tv - please elaborate.
Also, what resolutions are you having trouble with? It looks to me like you're trying to run 960x540p, is that right? I will say that on my Mits 55", 960x540 has a lot of overscan & makes a desktop kind of a pain to navigate. You might want to try 856x480 @ 540 timings (per Karnis's guide, linked above) for a better fitting desktop. I use 1920x1080i for DVD playback - not sure if the GF cards are supporting interlaced, though (they weren't when I had a GF card in my htpc).
The next thing is that if you have a lot of trouble with custom resolutions, such as getting the display adapter to accept them, you may want to try a Radeon card. I went round & round with my Ti4200 & couldn't get what I wanted until I bit the bullet & got a Radeon 9600. Everything works as it should now. Might want to think about that as a last resort, though.
Hope that helps.