might need to update u driver for u monitor go to the site where u monitor is made (tag on bak of machine will tell u maake n model #) install a new driver
Check monitor connections at both ends. Gentle rock the cable, and be
sure it's firmly seated.
Run the DEGAUSS function on the monitor (once). See the manual for
instructions.
Move any magnetic fields, such as speakers, away from the monitor.
Try another monitor, or move that monitor to another PC, as a test.
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