My HP Envy 23's HDMI IN port does not seem to be working - need to use as a second monitor

[PatrickP3]

I am trying to use my HP Envy 23 all-in-one desktop as a second monitor.  I have a HDMI IN port with a button just underneith it.  About 6 months ago i had it working although intermittantly.  Now it won't work at all.  I've done all the recommended updates to my Envy but now, nothing.  When I connect my work laptop to my Envy, it shows on my laptop screen as if a second montitor is there however when I go to "Customize your display" and click on "Detect" I get the error that it "Didn't detect another display".  Even through the image shows 2 displays on the open window.  When I unplug the HDMI cable, the image of 2 monitors goes away and just shows 1.  That tells me that there is a "seen" connection between hardware devices however the display itself is not being passed to the Envy.  Ultimately I am trying to "extend display" to my Envy and not mirror it.

Thanks,

[banhien]

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@PatrickP3 wrote:

I am trying to use my HP Envy 23 all-in-one desktop as a second monitor.  I have a HDMI IN port with a button just underneith ...

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@PatrickP3 

The HDMI IN port is designed to accept signals in, not out. It will accept games consoles such as XBox, Play Station ..

Regards.

[PatrickP3]

Thanks @banhien.  I'm trying to use it as an input (second monitor).  It worked in the past but for some reason ended up stopping a few months back.  Not sure what has happed.  Not sure if it is on the Envy's side of the equation or on my work laptop's side.  I share screens at work and it works there but for some reason not at home.  Not sure what I'm missing.  Thanks.