I just noticed when I was working on something red in photoshop in full screen mode. Some horizontal lines down where the dock is. After I noticed it I made a full screen with different colors and its there but just not as noticeable. Its in all apps and all the time. Is this a new defect? Could this be a software or firmware problem or should I take it back? This is my second the first one had terrible ghosting and I would hate to risk getting another bad one and have to keep exchanging them if it might become fixed on its own.