I have an HP Envy 23-D038c, which has an HDMI In port but no HDMI-In button on the monitor. On connecting the HDMI cable to my laptop, the Envy 23 does not automatically work as a second screen(displays no automatic instructions to do so either). Also, there is no HDMI-IN button on any part of the monitor.
It does have HDMI-in port. You can control it using a button on the right hand side
Note: It is designed for game consoles. It may not work for a computer.
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