Airport Express not seen by G5, but PB G4 sees it

Hi there,
I got a Zyxel wireless modem but had problems to secure it even after long debates with their helpdesk, so i bought an Airport Express and connected it wired to my Zyxel and created a new wireless network, only this time protected.
The weird thing is, with my G5 i can connect wireless to the Zyxel network but not to the Airport Express (the G5 doesn't see it at all, altough it sees different network in my aera), but with my Powerbook G4 it's no problem to get on both networks, also with my friends Macbookpro it's no problem to get on both networks. Anyone got an idea because i want to get rid of the Zyxel network so my connection will be secured.
thanks, Arie

One idea that comes to mind is... what channel is the AirPort Express (AX) operating on? If it is using channels 12 or 13, try changing to a channel 1-11.

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