Something that hasn't been brought up... I've had some weird things like this happen when there was bad power. Make sure that you have your monitor attached to a UPS, or try a different plug. Test the voltage output from the plugs you are using, and make sure you have a good ground. Since you have tried several different monitors (and pc's??) it would seem logical that something at your location could be causing the problem. I just can't imagine that many monitors all being bad.
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