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Before you alter the systems drive how about creating a clean bootable USB thumb drive with the same or newer OS. Follow this guide: [|How to create a bootable macOS Sierra installer drive].

Once you boot up exit the installer and then see if WiFi works going into the preferences setting. Is that working? If not you have a problem within the logic board power services powering the Airport board. If the external drive works then you have a  messed up OS install.