Mac Airport Does not accept my password?

I have 2 laptops I can get online with one of them ,the other one is a Mac iBook ,I want to use my wireless (AirPort Exterem) it asks for password and then it says password is not correct I can not see this Airport base in my Airport configuration but I see its name on my list of available WIFI it happens only... show more I have 2 laptops I can get online with one of them ,the other one is a Mac iBook ,I want to use my wireless (AirPort Exterem) it asks for password and then it says password is not correct I can not see this Airport base in my Airport configuration but I see its name on my list of available WIFI
it happens only with my Mac Ibook,anyone had the same problem?? I need help
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