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Dual monitors - one blinks

HP Recommended
HP ProDesk 400 G1 MT
Microsoft Windows 10 (64-bit)

I have 2 monitors connected to my ProDesk 400.  One is connected using a VGA cable,  the other an HDMI cable  (using the connections on the back of the computer)

 

the one connected to the HDMI cable blinks for about five minutes (decreasing blink frequency over time) before displaying constantly.

 

Any suggestions on how to fix this?

 

Thanks for your help!

 

Art

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