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HP ENVY All-in-One - 27-p075na (Touch)

Hi all

 

I have been trying for weeks (in short bursts) to use my second HP Envy All in One as an extra monitor. I have two identical machines and thought it would be easy peasy to link via HDMI ports and fire up for double the screen width. But, when I link them with HDMI cable, the HDMI Out PC (Screen 1) immediately changes to a blank desktop, mouse stops working and PC freezes all but for a few options on the touchscreen. Cannot get them to detect each other at all. Help would be most appreciated, feels like it should be a plug and play situation. 

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