Having trouble connecting to wireless network

Hello. I am having some difficulties connecting to my Linksys router from my Powerbook G4. Here is my issue... sometimes airport can find the wireless connection (called Linksys) and sometimes it can't. I don't understand why it does sometimes, but other times it does not. I have a brand new iMac that is always able to find the network through the airport. I've never had problems with connecting the iMac to the wireless network, it's the Powerbook that will sometimes not find the wireless network in the drop down menu through airport. I don't understand how one computer can and one computer cannot. I was thinking maybe it's because the airport card is a bit older in the Powerbook and doesn't pick up as many networks, but like I said, some of the time it works just fine and it stays working until I shut down the laptop. Any ideas? I appreciate the help.

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

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