@Hcorrente
What is your HP All-In-One PC ? Does it have HDMI in port ? If yes, you have to use a switch to turn this port on. Where is the switch (if available), I need to know what is your machine.
Please use the following instructions to find out the model/product of your machine:
https://support.hp.com/us-en/document/c03754824
Please do NOT post its Serial number (s/n).
Regards.
BH***
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