I had a problem like that and a friend told me "degauss". i didn't know
what that meant but while buying a used monitor, i saw the word
"degauss" on its menu and tried the feature, it worked. talk to a
technician and he'd explain what degaussing is about, that should solve
the problem.
He is experiencing different symptoms from those caused by poor magnetic
purity adjustment.
De-gaussing:
Magnetization of steel components of a monitor - such as its chassis -
can interfere with the trajectories of the CRT's electron beams and cause
colors to shift, a condition known as purity failure. Degaussing refers to
the act of demagnetizing the region near the front of the monitor, to
remedy this situation. Modern monitors have degaussing circuitry that is
actuated at the instant that the monitor's power is applied. Although it
is generally best for stability reasons to leave your color monitor
powered on at all times, toggling the power off then on will initiate
degaussing. You should do this any time you physically move or rotate a
monitor more than ten or twenty centimeters.
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Zack
Every operating system out there is about equal. We all suck.
(Brian Valentine of Microsoft)