MacBook Pro is not displaying Wi-Fi networks Early 2010 MacBook Pro, with Yosemite is unable to lookup any Wi-Fi network all of a sudden.

Tried reseting SMC and NVRAM

It shows Wi-Fi: Looking for Networks... and then Wi-Fi: On. Does not list the available Wi-Fi Networks

Any pointer would be appreciated.
Sounds like it might be a bad Airport card, if you have the tools, open it up and then disconnect and reconnect the antennas connecting to the card. If that doesn't work, remove the card, clean the contacts with isopropyl alcohol on the card and then reinstall it. If that doesn't work, you'll need to buy a new card, specific for your model of MacBook.