AirPort / Wi-Fi Card Not Detected

Problem When you attempt to connect to a wireless network on your Mac, you see the error “Wi-Fi: No hardware installed” or “No AirPort card installed” instead of any options. Solution Reset PRAM.

Internet not working using WiFi / AirPort

Make sure you know your network passkey as you will need to re-enter it. Go to your main hard drive (usually Macintosh HD). Go to Library -> Preferences -> SystemConfiguration Delete the following files: NetworkInterfaces.plist preferences.plist Restart the computer. You will need to set up your wireless connection again including the passkey.