No Airport card installed error

Hi evrybody
I've just bought a Macbook Aluminum 13inch. Everything's ok, but suddenly, when I click to wireless icon on the menu, it say: "No Airport card installed".
I did the following:
+ In System profiler --> Airport card: No information found
+ Hardware test: No problem
+ Update software
+ Reinstall Mac OS
+ Remove battery, hold Power button for 10s
+ Press Option + command + P + R
But still "No Airport card installed".
It happened when I use 10.5.5. I update to 10.5.6, and then 10.5.7, there's no use.
I'm in Vietnam, there's no trustable Apple care here. Please help me.
Thank you much.
Message was edited by: mekimdung

mekimdung wrote:
Thank you. I brought my Mac to the provider. They said they gave a new one for my Mac. It run now. But I think that they only update firmware because my card serial is still the same. Any way, it run now. Thank you for your help.
I don't believe that the new (unibody) MacBooks have any separate AirPort card that can be individually replaced. The photos I've seen of disassembly don't seem to show any separate wireless card. It's just a Broadcom BCM4322 which is more than likely permanently soldered to the main board.

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