Can't automatically connect to Airport and Internet after restart

I run a brand new iMac Intel and an AirPort Express. Each time I reboot my iMac I loose my Internet connection. The machine says it's got full coverage signal and that it is connected to my preferred network. Still, I can't browse the Internet (tried even with IP-only) or read e-mails or anything else.
The only way to get back on is to turn off Airpot on my computer, and immediately after turn it on again. Then everything works as it should.
But I want it to connect automatically as it is supposed to.
I found the following page at Apple support, but it didn't solve my problem:
http://docs.info.apple.com/article.html?artnum=304482
Anyone else experiencing the same problem, or having any clue why this is happening and/or how to solve this problem?
iMac 24" Intel Core Duo Mac OS X (10.4.8)

Yes, Blue Rider, I am experiencing that problem. I went to the Apple support page that you referenced, but doing what they suggested didn't solve my problem either. This lack of automatic connection affects my mail program too. I have to click on a connection button to activate the mail. All this for me started a few days ago after a recent security update. Tomorrow, I'll be calling AppleCare. I hope they can figure it out.

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Eulogio,
i went through a similar thing in the past weeks: my iMac had suddenly problems connecting to my network, whereas the PB connected OK. at the end things turned out to behave in a logical way: if the PB and the Airport-express base station talk to each other, and the PB can configure the base station, whereas the iMac has problems (once making contact and loosing it very fast, the next time not be able to connect, saying: "there was an error in connecting...", and so on) - this means (and has been verified by the service guys) that the iMac is the cause, not the base station.
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Can't automatically connect to Airport and Internet after restart

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