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One of the primary colors is missing from all displayed images, or one of the primary colors flickers in intensity intermittently
Explanation: The displayed image either permanently or temporarily shows the loss of one of the primary colors, making the whole screen look like it is being viewed through a greenish, bluish or purplish tint. Usually this means that one of red, green, or blue is missing from the image regardless of what is being displayed. The problem may appear intermittently, flickering in and out, or it may be present all the time.
Diagnosis: This problem is normally caused by a break in the connection of one of the three color signals between the video card and the monitor. It is very common, particularly with older monitors.