Oh, well that is a particularly rare problem. However on this occasion these may be the problems.
1) The video card may be going bad
2) The monitor's connecting port or wire is damaged
3) The monitor's bulb is dying
4) Strong magnetic field surrounding the monitor causing massive interference
Observe these problems carefully and figure out which one it might be and get back with me as soon as you can so I can give you a reasonable solution.
Thank you!
Look through your manual. Your manual will always give you the most specific directions for your particular model. Look for an "adjusting convergence" or "set manual convergence" section.
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