Wifi doesn't work: interface not powered
Interestingly it does show Connected but the WiFi settings are wrong and the Network settings are wrong?

Anyway, lets bypass the GUI and use Terminal for some direct commands.

In Terminal type (to turn it on)

networksetup -setairportpower en0 on


Next type (to scan)

/System/Library/PrivateFrameworks/Apple80211.framework/Versions/A/Resources/airport scan


Finally type (to connect)

networksetup -setairportnetwork en0 WIFI_SSID_I_WANT_TO_JOIN WIFI_PASSWORD