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Maybe Sony sets detect which game console you've got plugged in, and degrade the signal if it's not a Playstation. :-)

I'm going to check your last few suggestions out soon (I've been so busy!), but I thought I'd mention that I don't think it's a problem with just this TV. Perhaps your theory here is correct, because I also tried it on a 2 year old 60" Sony set and it does the exact same thing. So yeah, I'm not sure it's the TV. Besides, I would be willing to bet that the video game mode probably just changes some brightness and contrast settings and not much more, but I'm willing to give it a shot.
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Matt