If the machine’s WIFI isn’t working, and there are no networks found, then the LAN only button isn’t maybe a viable choice.
Compare the IP addresses of all your machines, just to make sure you don’t have an address conflict at the router (addresses cannot be shared). You might have to check the device list in your router settings to make sure all devices (phones, computers, game consoles) have no address conflicts.
Maybe the wifi antenna is bad, or whatever it plugs in to?