Imac failing to see any wifi network

I have an Imac which is just over 6 months old (purchased December 2011) running LION, it has been connected to our wifi network since we set it up and there have been no problems, the mac has also been able to see other wifi nextworks available in our area.
A few days ago the Imac suddenly had no wifi and on turning the WIFI on and off it became apparent that when it scans for wifi it can see no wifi networks at all.
I have rebooted the machine and the router etc to no avail and all other Macs, phones and ipdas etc are able to see and use the wifi network successfully?
Has anyone had this problem? is there anything more I can do before I box it up and take it into the Mac Store to see an expert?
I assume its a hardware failure?
PS I have connected the mac with an ethernet cable and that works fine, its just not able to see any wifi networks.
Regards
Dave

Hi!
I bought my imac 21,5 before 2 months after all lies from people dont understanding computers.
Yes, I have exact same problem. I am using safari then suddenly the wifi is off. And it scans for wifi networks but it cant find any networks. I am using my old pc now and writing this post. If I restart the imac the wifi gets normal and i can see my network and other networks.
I have applecare too, 3 years. But i dont know what to do. If you ask apple they will told you "the problem is unusual, or they will told you its not usual that people get problem with mac. If you ask mac users, they will told you "you never get problem with mac" BUT THEY ALL LYING!
(i have other problems too with my imac. sometimes when the screen enter sleep mode I cant turn it on with the magic mouse or keyboard. I can only turn it on with screen-powerbutton then after maybe 10 sec the login-screen turns black. then I start the screen again with screen-powerbutton the screen turns black again.etc.)
Of course it is hardware issue (I am expert user of pc) but the problem is Apple dont want to belive that a mac can get problem. And people using mac are afraid of the word virus or computer problem therefore they buy from Apple.

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