Red pixels in my plasma TV?

I recently bought a plasma TV from a friend of mine, a 42 "LG Plasma, I have noticed that has points appear as red objects / people move across the screen on a black background. It is only noticeable through my PS3 HDMI cable, while I'm playing a game or watch a Blu-ray. This is a common mistake, and something to worry about, or may be just a fault with my cable?

Maybe the contacts on the cable are messed up or folded. Or maybe it's just dirty. But I definitely say that the cable is the root of your problem.

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