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Is your monitor separate from the computer as opposed to being built-in like a laptop? If so make sure the cable connecting the display to the computer is secure on both ends. If you have an extra cable, you might want to try that one instead. The cable carries the red-green-blue signal to the monitor and if it is not seated properly you can miss out on one of the colors which can turn everything a strange color. Those cables can also go bad. If you have access to another display I would also try connecting your computer to that display and see if you still have the problem.
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