I'm thinking it's not anything wrong with your xbox. Do you have a regular DVD player hooked up to your entertainment center? If so, try the same movies where you have pure whites. If you have the same problem, my guess is what's causing it is the "noise" from the pure white. Basically pure white = RGB 255,255,255 to the TV, which takes a considerable amount of power to create. The noise is caused when the TV ramps up it's power to create that pure white, basically it causes a static interferance with the stereo/reciever (or the internal speakers in the TV, if that's what's being used). The blurring could also be attributed to the TV.
One thing you'll notice in any broadcast signal, from local to satellite/cable service, there won't be any pure whites or pure blacks, because of this reason (close at times, but not 255,255,255, or 0,0,0). Pure black is essentially turning the TV off, to display other colors causes power fluctuations, which also cause their own noise. Public Access channels have shows that are notorious for using pure whites and pure blacks, and you get the subsequent noises from them (be it pops in the speakers, distorted pictures on the screen, or a low hum or buzz coming from the screen/speakers).
How old is your TV? If you have the same problem with a regular DVD player, I'd have your TV serviced, or if it's pretty damn old (5+ years), I'd replace it. If you have an LCD/Plasma TV, or are using a projector, then you shouldn't be having this problem (unless it's a front projection big screen TV), and maybe it is the XBox.
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Last edited by DarkWolf; 10-27-2004 at 03:05 PM.