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If you are trying to use this computer as a bigger monitor for your laptop, you need to plug the HDMI cable into the HDMI in port. Then, you need to change the input on the screen. Here are some troubleshooting steps you can try with the keyboard and mouse: https://support.hp.com/us-en/document/c00006821#:~:text=If%20a%20wireless%20mouse%20or,USB%20port%20on%20the%20computer.
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