Unplug the video cables from the back of the computer or the monitor.Make sure that the screen is clean (no dust particles on the surface of the screen). When you notice screen abnormalities like distortion, clarity, horizontal or vertical lines, color fade, it is always a good practice to isolate the monitor by running the Built-In Diagnostics. It helps to determine if the screen abnormality you are experiencing is a problem with the monitor or with the video card on your computer. Your Dell P2422H monitor has a built-in diagnostic tool.
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