3 Quick Fixes for Screen Flickering
It sounds stupid, but 90% of flicker is a loose HDMI/DP cable.
Unplug both ends. Blow on them. Re-plug firmly.
Old GPU drivers hate Windows updates.
Use DDU (Display Driver Uninstaller) for a clean install.
Did you set 144Hz on a 60Hz cable?
Lower your Hz in Windows settings to see if it stops.
Use our Test Pattern to identify defect pixels.