The wifi will not turn on on my macbook
I have a macbook with OS X and my wifi will not turn on at all. It was working just fine and after leaving the computer for awhile I returned and the wifi icon was blank and under network preferences it will not even allow me to turn on the wifi. The status shows "Off" and when I click on turn wifi on, nothing at all happens. I have tried deleting and readding wifi as a connection option as well as restarting my computer, unplugging and re-plugging my router, and nothing works. The wifi works just fine on my iPad and iPhone. Please help!!
MacBook, OS X Mountain Lion (10.8.5)