No automatic connection to a wireless router after startup!

After adding a new wireless router to my home network an iMac G5 does not automatically connect to the wireless network after startup.
And so the story began: I'm running a wireless network for years without problems at my home. The wireless router is a Orinoco 102.11b with 128-Bit WEP encryption and I have 4 different Mac connected to it.
Because I wanted to use the higher 54 MBit/s speed and a more secure encryption for my network I've installed a LINKSYS wireless router and configured it for 102.11g and WPA2.
Everything worked fine except the automatic connection after restart on my iMac G5 running Mac OS 10.4.10. I can connect to the new wireless router but I have to do it manually after each restart. The password is therefore stored in the login keychain. The connection can be established automatically after sleep but not after startup...
So I switchted the connection back to the old router and got unfortunately the same behaviour. The iMac does not connect any more automatically to the router after startup. I removed the new router from the network, deleted all wireless passwords from the system and login keychains, created new keychains, switched back and forth the preferred vs. automatic network selection, created new locations, changed the root password and so on...
It seems that the new password entry in the system keychain causes an error in the password encryption of the system keychain which prevents the automatic connection to the network after startup. Replacing the keychains from my backup does not work either after I've once created a the system keychain.
Is there any log file, which may proof my assumption or can give me some more information of the erroneous login process to the wireless network during startup.

One thing that can work, try this, *please ignore the exact symptoms and connection and Hardware types*, it's worked for many others than the stated...
http://docs.info.apple.com/article.html?artnum=304482

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