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HP Envy Desktop 750 flashing black screen

HP Recommended
HP Envy Desktop 750
Microsoft Windows 10 (64-bit)

My screen flickers black a couple dozen times a day. Started suddenly about a month ago. I've tried driver updates, all good. Opened Task Manager and it doesn't show up there. System is just over 3 years old (Dec 2017). Could it be the monitor, HP 15.4"? Not sure what else to do. Thanks.

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