IMAC can not see any wifi networks at all?

IMAC can not find any wifi network at all. 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 several other computers and they all see the wifi networks fine. I assume it is a hardware issue but the hardware test I preformed comes up with no errors. Anyone got any ideas?

Hello Sage10,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628?viewlocale=en_US
Best of luck,
Mario

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