it is the stray magnetic field near the moniter, which is causing the colour patches on the moniter.Do u keep the speakers too close to the moniters?
also, if ur monitor is a new one, then u should have "Degauss" option in it, just browse through the OnScreen menu of ur monitor and select "Degauss" option, this will sort it out....
if ur monitor in an old one, it may not have a degauss option, just switch off the monitor for some time and then switch on it, everything will be alright.....also dont keep speakers too close to monitor...Check if ur speakers are magnetically shielded or not....
this is not a major problem.....
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