MacBookPro2,2 often won't see/join SAVED closed Wi-Fi networks 10.6.8

At both my office and my house my MacBook Pro 2,2 only connects to saved Closed Wi-Fi networks sparatically. One router is a 5th gen Airport Extreme the other is a business Netopia router. So the issue is obviously with my MBP not the networks.
I have deleted and re-entered passwords in Keychain and can view the saved networks in Network prefs>Airport>Network Name dropdown. Sometimes the MacBook Pro will automatically join these networks but often it will not.
My iPhone 4, iPad 2 and my wife's iPhone 3Gs all join my Closed home network, every time. No problem.
But my MacBook Pro is very hit and miss. I often have to Restart my MBP or even delete the network and re-add it or manually enter the network and password. The latter often results in a connection timeout error.
Anyone have a solution for this? Any prefs I could trash?
How does my iPhone get his right but my MBP can't?
Thanks

We have moved our support forum for the OS Consumer Support (almost any support of the Preview for Developer
release that is not related to developing an application) to the Microsoft Community website. (http://answers.microsoft.com/en-us/winphone/forum/wpdp )

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