How come my Wi-Fi network will not work after I updated my iMac to OS X Mavericks?

I just updated the OS on my iMac (late 2009) to OS X Mavericks and now the Wi-Fi network that I had previously set up and used for internet access for my iPad mini and my Nintendo Wii U will not work. It worked fine before with Snow Leopard.

Begin by restarting the computer, if that does not help then do 2-3 SMC and PRAM resets (instructions below) and if those do not  work reset your modem and router (I don't care if other devices work) and ensure the Router is has the most up-to-date firmware installed.
Intel iMac SMC and PRAM resets

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