No airport signal!

Hello, here's a question for the pros..
My Mac Book Pro is not picking up any signal. Network connect says airport is turned on, but no network is available.
However..
My friend's computer, placed right next to mine receives full signal and can select the network to join.
I have diagnosed as much as I can, and have compared our settings and they all appear to be identical. Can someone, anyone please help!
Thanks a lot!
Ian

MacBook Pros were introduced in January 2006 but not shipped until February 2006 so your purchase date should be less than one year ago.
Your MacBook Pro (any Mac) has a one year hardware warranty and 90 day free telephone support. If you purchase AppleCare (must be done within one year of purchase of the MacBook Pro) both the hardware warranty and telephone support will be extended to 3 years from the date of purchase of the MacBook Pro.

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