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Desktop all in one screen randomly goes black for a second

HP Recommended
EliteOne800 G2 23in non touch AiO
Microsoft Windows 10 (64-bit)

The screen on my EliteOne800 G2 23in non touch AiO has begun blacking out for a second every few appears a bit random and is inconsistent. There is no error message that appears, and everything keeps working fine, the screen just blacks out and then comes back after a second...its wierd.  I tried cleaning up my desktop and freeing up some RAM, I tried defragging the hard drive and have run systems checks that say everything is fine...but still the blackouts...this only started about 10 days ago but does not seem to be going away ?

Any suggestions ?

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