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2nd Monitor keeps going off

HP Recommended
Prodesk 400 G4 Microtower
Microsoft Windows 10 (64-bit)

I've added a 2nd monitor to the PC using a Display Port to VGA cable, first monitor using display port to VGA cable.


The 2nd screen comes on and then goes blank and can see flickering in the background.  Sometimes shows no signal and then comes back on temporarily.  When it is on I can see lots of tiny dots on the screen.  I've swapped the cables over and the fault still remains.



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