Hello all, I just purchased this great plasma panel TH-42PHD8UK. Now that I connected it to my Comcast cable hd digital cable box, I am thinking that I might have a problem. Here is the deal: when screen turns darker... black or dark gray, I can see a reddish horizontal bars that slowly go from the bottom of the screen to the top. The behavior is constant, but only when I connect it to my cable box (when I connect to the dvd player, all is normal) I know that this panel does not come with a tuner, but I thought that my cable box has a built in tuner. I really don't know what to think of this. If anyone knows what is going on please help.