Fn+F1 Wireless LAN on/off - what happens when you press this key combination >?
Does Device manager show any listed "Other Devices" with item listed beneath ?
Underneath is a big dark grey service panel - Unfasten eleven 11 screws and pull out the big door and HDD door. You will see the wireless card to the right of the fan. It may - have been removed and is not there. Is there but is not seated correctly. Is there but the slot is fail. Alternatively you can get a usb external wlan if you dont like checking