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The screen image is distorted, with wavy lines or warbling of the displayed image
Explanation: There is a viewable image on the screen, but it is not stable, but rather somewhat distorted, moving slowly, warbling, or has wavy lines moving up or down the screen.
Diagnosis: This kind of problem is usually the result of interference from another device affecting the image. There are two possible sources of interference: first, another device could be emitting electromagnetic radiation that affects the viewed image; second, another device on the same electrical circuit could be creating interference on the power line that affects the monitor. If the image appears totally scrambled and unviewable, this is usually a different problem.