one thing may be strain on your VGA coard (assuming thats what you use) check and make sure that no pins are bent in either ned, and that there is no strain. always use slack in electrical wires!!!!

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also you may want to check and make sure that nothing is creating a magnetic field, as this is because it will create mass amounts of interference, I used to have a set of 15" subwoofers 10 feet from my monitor, and it would wave and change colors!

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