Hi,
i have the same problem with my MBP 15" Early 2011, the airport Bluetooth is functional but not the Wi-fi.
The Wifi Icon indicates hardware not installed.
I have tried everything, Clean install, change hardware with airport cart and Antenna and the procedure outlined earlier in this page.
Nothing works, i hesitate to change the flex cable Airport but I would like to be sure that this is before ordering the piece.
please, help me.