How do you reinstall internet, not showing Wi-Fi on MacBook pro 2013
When Hardware disappears or stops working, the first line of defense is an SMC reset:
How to reset the System Management Controller (SMC) on your Mac - Apple Support
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You cannot “reinstall” internet. You need to check the machine’s connection to your router/modem. Check System Preferences > Network. You may also need to go to the modem’s web page (check the instructions, it’s usually something like 192.168.x.x) and make sure that is working and has an active connection.
How to reinstall internet
