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First thing to check: did you recently unplug the monitor cable and plug it back in? If you accidentally bent one or more of the pins inside the plug, that will cause colors to disappear.
Next: If all your pins are in good shape, I second percussive maintenance. Beat the shit out of it until the blue and red guns come back on. Worked like a champ on my piece of crap Relisys monitor for years.
If percussive maintenance fails, find a tall bridge and have fun chucking it from the peak :-)
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