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The video output is scrambled on the screen, the picture appears to be a tight mass of diagonal lines moving around
Explanation: There appears to be a signal from the PC, but the picture is scrambled or wavering a great deal. The image cannot be viewed clearly.
Diagnosis: This sort of image problem can be caused by incorrect driver or refresh settings, or by a problem with the monitor itself. Note that occasional waves on the image are usually a different problem.