I purchased a Sony KV-32HS500 at the end of December. Every component has been working great EXCEPT when I connect my PC to the TV through composite or s-video. The image shakes horizontally about 1 centimeter every half-second or so. It is most noticeable when a DivX or (S)VCD movie is paused or there are no fast movements. It is also noticeable just on the desktop, with my background image. It is extremely annoying. I have two PCs with identical cards (ATI Radeon 7000 32mb AGP) and have tried both of them on the same TV, but the other ones does the same thing as the first. S-video out on my 6 year old Sony Trinitron does not have this problem, but I would rather watch movies on a 32" rather than a 20".

What could be causing this? How can I solve it besides the obvious option of buying a completely new video card? I've tried upgrading drivers and fiddling with CATALYST options but nothing helps.

TIA