Can anyone explain why airport connects but no Net connection?

greetings all, i have a small and what i hope is an easy problem to solve..
my parents have wi-fi as well as my brother in his home, all i do on my macbook pro is turn airport on and it connects seemlessly..and i'm on google in 2 sec's...
but WHEN i go to my brothers house.. airport finds the network and jumps on it instantly and i have full service strenght. but no matter what i can't connect to any web pages,, they time out and i get a msg stating that i'm not connected to the internet... i eve tried my email prgram and nothing..all other net app's fail too..
how can this be if airport is finding the network? neither my parents nor brother have their network protected i.e. no WAP or WEP ect... so what is the deal?
even tho i'm connected on airport its like i'm not.. my brother has linksy's router and his sony viao jumps on it wit no problem at all!
anyone have any ideas or what i can do?
oNe
p.s. at my home which is an apartment there are several "open" networks and again the macbook finds them and jumps on them wit no problem... but i stick to my plug in net connection for security reasons...can't trust open networks.. sides my parents and brother i guess..
macbook pro 17" pimp ish   Mac OS X (10.4.2)   it came stock..

I wish that was the answer, but it doesn't seem to be the case. I have a Linksys wireless router in my office with no other users and no security provisions installed. Most days, I can bring my Laptop in and connect right away. Other days, like today, it simply will not connect, despite having a full four bars showing. If I go into Internet Connect, it confirms that I am connected to Linksys. However, when it fails to open any Internet page, I get the terrible message "You Are Not Connected to the Internet." I am then prompted to open "Network Diagnostics" to solve the problem, which it never does. Obviously, someone needs to introduce "Internet Connect" to "Network Diagnostics" since they clearly have never met.
I have experienced this situation in other locations, so it clearly is not limited to the one router. While I am ordinarily a big Mac fan, this problem drives me stark raving mad. Being a simple person, I just cannot fathom how a computer can be connected to the Internet, but...not...connected...to...the...Internet. Since I don't own any firearms, shooting my computer is out of the question and I don't really want to hurl it into the ocean. Any words of wisdom would be greatly appreciated.
Mac PowerBook G4 12"   Mac OS X (10.4.9)  

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