I have a 13'' MacBook Pro from early 2011. Suddenly it can't find any WiFi Networks anymore. It used to find networks (including mine) at my home, but now it doesn't.
I cant remember when this happened, most of the time i'm using ethernet.
I installed all updates, repaired the permissions, tried do de/activate Airport, deleted
/Library/Preferences/SystemConfiguration/com.apple.airport.preferences.plist /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist /Library/Preferences/SystemConfiguration/com.apple.network.identification.plist
rebootet several times. Still no wifi.