Wi-Fi interface missing I have a Macbook Pro from 2011 currently running OS X Yosemite 10.10. Before i upgraded to Yosemite, i was experiencing a common wifi issue that was that the wifi disconnected from the internet and it couldn't be turn on or off; sometimes, when i turned on the mac, a "No hardware installed" message showed. 
I replaced the wifi card but the problem persisted and now that i upgraded the OS, the configuration didn't recognise any hardware and no Wi-Fi interface is shown on Network Preferences. 
I know there is a file Library/Preferences/SystemConfiguration/NetworkInteraces.plist that contains these interfaces information.

Is there anyway that i can configure this file to add the wifi card? or is there something else that i can do? knowing that replacing the wifi card didn't solve the problem and that it may be a software issue?

Thanks
It's possible that Wi-Fi service is disabled in your system, check by:

sudo networksetup -listallnetworkservices


If you see an asterisk (*) next to your WiFi, that means the service is disabled. Enable it by:

networksetup -setnetworkserviceenabled WiFi on
networksetup -setairportpower en0 on


Same for any other network services which are disabled. See also this post and this post.

Then restart your system to start these services at startup.