can't print to network printer since WPA password set up

Hi there, be very grateful for any help with this problem. We have a netgear router with a Xerox phaser printer attached. Recently I set up a WPA password on the router. All macs and pcs attached to the router can still use the printer, apart from a G4 powerbook running Leopard. Attempts to print to the network printer result in the Printer coming up with a 'printing' message but nothing actually printing. When I attach the printer directly to the powerbook with a cable it prints fine, so it's not the driver. When I switch off the WPA password on the router it prints fine over the network. I've run out of ideas on this one!

As a rule G4's cannot handle WPA2 Personal. WEP is the go for them alas.

thanks

thanks harryb2448 really appreciate the fast response, can feel my headache receding already