My G4 won't detect my own network

My Powerbook G4 quite suddenly won't detect my own home network (Airport Express) upon starting up.
It "prefers" to want to join my neighbours weaker signal networks. My network name does appear in the drop down list under the airport icon and I can select it manually and it happily joins. But it won't do it by default like it always did from day one. I may have changed a setting.
How do I get it back to always joining my own network by default?
Powerbook G4 Mac OS X (10.4.8)

Open system preferences and select 'Network' and then 'Airport' either from the 'Network Status' menu or the Show: drop down menu.
The first tab for 'Airport' says:
By default, join: and a drop down menu.
Make sure that drop down says 'Preferred Networks' and then select your home network from from the list. Apply the settings.
That ought to fix it.

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My G4 won't detect my own network

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