No Airport Card Installed
This are few option which is work for my MacBook Air, there are basically three options:
- you deleted the AirPort connection by accident
- your system lost track of it for whatever reason
- your AirPort card is damaged
First I would try to open up System Preferences, go to Network and at the top create a new Location.
2nd option, Turn off the MacBook, then turn it back on and hold Command-Option-P-R. Keep them held down until you get three startup chimes, then let go.
3rd Option, If this doesn’t help force a redetection of the hardware via Terminal.app and the command /usr/sbin/networksetup -detectnewhardware
4th and your last option is to delete the file containing network hardware informations.
/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist
delete this property list and then restart your system.
If neither helps it is most likely and issue with the card itself.
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