My macbook pro no longer connects automatically to my wi-fi network

Does anyone know why or how to fix the fact that my macbook pro no longer automatically connects to my wi-fi network?

Delete all the preferred WiFi networks, and try making the current one the preferred network in your Airport Utility setup.

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    Apple computers: Troubleshooting issues with video on internal or external displays
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    HI,
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    You posted in the Safari forum. Try posting in the Leopard or MacBookPro forum instead.
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