NEC C Manual page 37

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There is constant movement on the screen
A magnetic field is affecting your monitor. Move any devices
(fan, motor, another monitor) that generate magnetic fields
away from your monitor.
If possible, position the monitor to face east.
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The screen display is fuzzy or flickering, graphics
characters or garbage appears on the screen
Check that the video refresh rate and video driver are correct.
For information about checking and changing video drivers,
see your computer documentation.
Press the degauss button once. Caution: Wait a minimum of
20 minutes before pressing the degauss button a second time.
Do not hold down the degauss button continuously.
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Display image is not centered, too small, or too large
Use the monitor's On-Screen Display to adjust the image.
Select and adjust the size and position settings.
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Display image is scrolling
Check that the monitor signal cable is tightly secured to your
computer's video connector.
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Left and right edges of display image are curved either
inward or outward
Use the monitor's On-Screen Display to adjust the pincushion
setting.
If possible, position the monitor to face east.
Solving problems 33