Powerbook 12 breaks network

I have a MacBook Pro connected to the Internet through a BT Voyager 2100 wireless router.
Everything works fine until my wifes Powerbook 12" is switched on at which point the connection is lost until the powerbook is switched off.
Both machines are running 10.4.6 and are configured identically.
The only way both machines have shared the connection in the past is by reinstalling 10.3 on the Powerbook.
Any help would be most appreciated...
Thanks

It is possible that for some reason both computers are trying to use the same IP address but normally a dialog window would appear alerting you to this fact.
Try manually assigning IP addresses to each computer.
Also try scanning your area to see if there are any other wireless networks that are confliction with yours. Usekismac to do this.

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Powerbook 12 breaks network

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