Air port not working

Hello,
I have a problem with connecting to wireless internet.
I have an airport Extreme card.
My computer usually recognises a wireless connection for about 10 min then disconnect, then sometimes finds it again for even shorter period of time.
It isn't about the network as I've tried it on different network and other mac user could connect to those.
Can anyone help me locate where the problem come from?
Do I need to change my airport card?
Thank you for your help,
Fanny

This will be a funny question, but it's better to ask. After you disconnected your iBook from cable modem, did you plug the ethernet cable to your router? I believed it's also a good practice to completely turn off your cable modem and your router while swapping/plugging the ethernet cable from your modem to your router.
iBook 1.42GHz   Mac OS X (10.4.5)   Alienware Area51mm

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