I'm sorry to hear that you're having this issue.
Is this happening on all inputs, or just with the cable/sat box?
I have just acquired a new 40" LCD Samsung HDTV. There is a very thin horizontal line across the very top of the picture screen. It appears to be the last horizontal line from the bottom of the screen picture. Why is it there and can I do anything about it?
Bear in mind that I have less than zero electronic ability.
The model number of my TV is LN40C530F1F. It's connected by a cable box.