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HP AIO as 2nd Monitor for HP EliteBook Laptop (Company)

HP Recommended
HP ENVY All-in-One – 27-K400NG
Microsoft Windows 10 (64-bit)

Hello @all,

I've read some articles to nearly the same Issue, but I can't find the right answer to solve my problem.


I want to connect my company owned laptop (HP EliteBook 840 G3) as main monitor to my private HP ENVY All-in-One – 27-K400NG. I know, it's a bit older, but at the bottom there is a HDMI In-Button which I can push - but there is no reaction?!? 


I've connected both with an Displayport to HDMI-Cable but none of both computers will find each other... Am I doing still something wrong or is it just not to combine?


Thanks for your help

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