My IMac is no longer picking up my wireless connection.

My IMac all of a sudden is no longer picking up the wireless connection.  It works with the ethernet cable attached.  My I-phone picks up the wireless, and I have worked with my internet service provider and they can't help me.  They said it was the router, but the I-phone works wirelessly here at home. 
Any suggestions?
I will be deeply grateful.  Thanks!

What version of OS X?
This is beyond my experience, but appears to be a solution for Snow Leopard.
http://reviews.cnet.com/8301-13727_7-20075509-263/addressing-self-assigned-ip-ad dresses-after-installing-os-x-10.6.8/
Though you didn't happen to mention recently upgrading your OS X version so I'm not sure what would have caused this change.
Also, here is another form thread regarding this problem. Someone fixed it by shutting off the router!
https://discussions.apple.com/thread/2268121?start=60&tstart=0

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