IMac fails to connect automatically to WiFi network

This is a re-submission of this request for help because I got no response the first time around.
The trouble began after upgrading to Snow Leopard. Prior to the upgrade I was running 10.5.8 and the airport wireless card would reconnect perfectly every time the computer woke up. After the change to 10.6, it's hit and miss. Sometimes after waking up, the computer will find my wireless router and connect with no problem. On other occasions it will not. Here's what I've observed:
When it fails to connect, if I immediately click on the wireless icon on the menu bar it will show no wireless networks at all, not mine, not any of my three neighbors, none. If I wait a few seconds (less than a minute) they will suddenly be detected. At that point clicking on my network will result in an immediate connection. I do not know why it takes so long for the Airport card to detect the networks, but that's not the issue. It eventually does. The problem is that the iMac has stopped trying to connect by then.
How can I get the computer to keep trying to log on (at least periodically) until it succeeds?
Any help will be greatly appreciated.

Test after taking each of the following steps. Back up all data before making any changes.
1. Make sure the network is on the preferred list by following these instructions. It's important to read the article carefully, as it's the starting point for any further efforts to solve the problem. If you skip any of the steps, the problem may not be solved.
2. Follow the instructions in this support article under the heading "Symptom: The network connection drops unexpectedly."
3. Make a note of all your settings for Wi-Fi in the Network preference pane, then delete the connection from the connection list and recreate it with the same settings. You do this by clicking the plus-sign icon below the connection list, and selecting Wi-Fi as the interface in the sheet that opens. Select Join other network from the Network Name menu, then select your network. Enter the password when prompted and save it in the keychain.
4. From the Location menu at the top of the Network preference pane, select Edit Locations. A sheet will drop down. Click the plus-sign button to create a new location. Give it any name you want. In the new location, set up the Wi-Fi service with the same settings you used before. Click Apply and test.
5. Launch the Keychain Access application. Search for and delete all AirPort network password items that refer to the network. Make a note of the password first.
6. Repair permissions on the startup volume.
7. Turn off Bluetooth and test.
8. Reset the System Management Controller.
9. Reset the PRAM.
10. Reinstall OS X.

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