Fix MacBook's 'WiFi: No Hardware Installed'

• So you have just switched your MacBook on and you realise you are no longer connected to the internet. You go to see whether you are connected to your WiFi and it displays 'WiFi: No Hardware Installed'

• Bummer. You don't recall removing your AirPort card from your MacBook! Don't worry. We have a few things for you to try.
• First off, ensure your Mac is completely up to date. Check the Mac App Store for any Software Updates.
• If updating didn't work, give the good old resets a try.

1) Shut down all applications (except for Finder - leave this open).  To do this, press Option + Command + Esc at the same time.  Then close all apps.
2) Completely shut down your computer
3) While its off, press all of these at the same time Ctrl+option+shift+power and hold this down for around 5 seconds.  Then release at the same time.
4) Power on your device normally using the power button. 

Post for MacBook & MacBook Pro Users