HP All-in-One PC 27 as External monitor

[Gianfranco1965]

Good morning can I use my computer (HP All-in-One PC 27-dp1000a (2Z4M4AV) as an external monitor connected to a hp notebook with an HDMI port? Basically I would like to display the desktop of the notebook on the monitor of my HP All-in-One PC 27. I have tried to connect it but it is not detected.

[itsmyname]

@Gianfranco1965 -- most All-In-One computers have one "HDMI-output" port, so that the output from the All-In-One can be displayed on an external screen, such as a High Definition Television.

Does your specific All-In-One computer also have a "HDMI-input" socket, to allow your laptop to send a stream to your All-In-One, to allow the stream to fill your screen, instead of the Windows Desktop filling the screen?  Without such a socket, you cannot do what you are trying to do.

[Prométhée]

Hi

In effect , In addition to the excellent information given by user @itsmyname 
according to the number you indicate, there are only two possible options @Gianfranco1965 

https://support.hp.com/us-en/product/hp-all-in-one-pc-27-dp1000a/2100389697/model/2100389527/product...

two different motherboards, but for both models it will only be an hdmi output

Motherboard Specifications, Stark

Back I/O ports

• (1) RJ-45 Ethernet port
• (1) HDMI 1.4b/HDCP 2.2 port
• (1) VGA port
• (3) Audio ports (Line-in/Line-out/Microphone)
• (4) USB 2.0 Type-A ports
• (1) Power input port

Motherboard Specifications, Weaver

Back I/O ports

• (1) RJ-45 Ethernet port
• (1) HDMI 1.4 port
• (1) Power input port
• (1) Headphone/microphone combo jack
• (2) USB 2.0 Type-A ports
• (2) USB 3.2 Gen 1 Type-A ports (5 Gbps data transfer)