I recently purchased a Panny 42PX50U and absolutely love it. Only have one problem. On certain stations at the top of the screen there is a small horizontal flickering line. It is not that noticeable on light background but on dark background it is very apparent. Being a newbie to the forum here, I am hoping someone will be able to provide some direction. I am not sure if this is a problem with the Panny, the Comcast cable box or a bad HDMI/DVI cable. Since it is only visible on certain stations, I was thinking it is either a cable issue or bad HDMI/DVI cable. Any thoughts ??