I don't recall seeing a blue line, but I will check more carefully. I have noticed recently that when there is a dark scene, the blacks are very 'fuzzy' with many colors almost like an oil slick. We also had a problem where neon signs in a movie looked florescent- very disturbing. I adjusted the picture last night and will have to see if that was it. I don't think so since we have had the TV 2 years and haven't adjusted it in a while. (rear projection Sony)