Check the refresh rate setting in the 'Advanced' settings of display properties. You have somehow set a refresh rate thqat is higher than your monitor is designed to handle, or have software installed which has settings which override the system settings and iare pushing the monitor beyond specified settings.
You need to determine where the setting change is coming from, and ensure that selected settings do not exceed the maufacturer recommended specifications for your particular monitor.
If it's not in display settings, then check all graphics utilities and games for excessive settings.
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Grandad
Offline 3,826 posts
since Mar 2004