Wifi connection failed

Hi,
When I try to connect to the internet using my iMac, I get the error 'connection failed' and i cant connect to the internet.  All the other computers and devices connect to the wifi just fine so i know it is a problem with the mac and nothing else.  What is causing this error and how do i fix the problem?
I had this same problem about a month ago, so I completely cleaned and re-installed the operating system and updated to Yosemite.  This fixed the problem until now.
Thanks

Can you connect to the internet using ethernet?

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