How can I use my laptop as a monitor for HDMI?
Plug the monitor’s HDMI cable into a flat HDMI port on the right or left side of the laptop. Make sure the other end is plugged into the display. The cable is identical on both sides, so it does not matter which end you connect to the laptop or monitor.
How can I use my old laptop as a monitor?
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How to Use your Old Laptop as an External Monitor – YouTube
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Can I use my laptop as a monitor for my PC?
The HDMI port (or VGA, or DVI, or DisplayPort) that comes on your laptop will only work for outputting its display and it will not work as a video input for another device. However, you cannot connect your laptop to your PC with a cable to get your laptop to display what your PC is outputting.