Hey, I was wondering if anyone has experienced any kind of vertical lines going up and down their screen that are constantly there, and dont move while watching TV through their digital cable box? I have a scientific atlanta Explorer 3250, which is a HD box ( i know i should put in the HDTV section, but didnt see a suitable place for this). On 2 different televisions, with the same digital boxes, bought 1 year and a half apart, I get the same problem which is these greenish vertial lines going up and down my screen. They are very noticeable when red is being displayed. But is there all the time, just difficult to see depending on the colour being shown. I don't see the lines when High def channels are watched, only standard definition ( 480i and 480p) channels. Anyone know what this is or have this problem too?

Thanks