How do I fix my input sound setting on my computer?

I recently bought a new monitor and PC for gaming. The monitor has an audio in port, but so does the PC. The monitor audio is the only one that works, because when I plug in a device to the PC s audio in, the monitor s speakers are all I here. Does anyone know anything I can do to fix this on Windows 1?
Update: EDIT: Windows 10 is the OS, not Windows 1
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