System Doesn't Automatically Connect To My Airport Network

My MacBook Pro (10.4.10) no longer automatically connects to my airport network (snow model). Airport Admin Util v. 4.2.3.
My wife's iMac also needs to manually find the network. This wasn't the case until recently.
Any suggestions?

Do you use AirPort's "Preferred Networks" setting when connecting to the base station?
If so, try the following:
1. Delete Preferred Network(s)
o System Preferences > Network > AirPort > Configure
o In the "By default, join:" pull-down menu, select "Preferred networks"
o Delete the network(s) you regularly use from the list
2. Delete AirPort Keychain Entries
o Launch the "Keychain Access" application located in Applications/Utilties.
o Click on the "Kind" filter at the top, and look for any "AirPort network password" entries...and delete them.
o Restart, or log out then back in.
3. Add Preferred Network(s)
o System Preferences > Network > AirPort > Configure
o In the "By default, join:" pull-down menu, select "Preferred networks"
o Add the preferred network(s) using the "+" button.
o Restart or log out then back in.

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