WI-FI: No hardware installed
Is there a software fix?
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How about running the onboard diagnostics to see if an error pops that can tell us what’s wrong. Restart your system and hold the D key.
You may also want to check the airPort board to see that its fully seated. Review this guide MacBook Air 11" Early 2014 AirPort/Bluetooth Board Replacement
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Sorry, not likely, can you tell us if you sat your system down on a wet surface or had a spill into the keyboard or trackpad.
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