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The screen image is bulging in or out in the middle (the vertical edges of the screen bow in or out)
Explanation: The screen image is not straight vertically. The image is either bending in toward the middle of the screen in a concave shape, or bending outwards in a barrel or convex manner.
Diagnosis: This aspect of screen image quality is normally manipulated using what is called a "pincushion adjustment". Some newer monitors have a control for this on the outside, while older ones generally do not.