Mac Pro won't connect to Airport but G4 Titanium has no problem

My Mac Pro has trouble finding the Airport(N) base station, it is connected to my Virgin Media Cable modem.
Airport Utility intermittently sees the base station but drops out with the messsage "Airport Utility can't find basestation but the airport indicator shows full wireless connectivity.
When the Mac Pro connects to the basestation, internet is extremely slow.
However, I have a G4 Titanium with 10.4.11 which has no problems connecting and surfing.
I have fully updated to latest software and firmware. Could this be a software conflict on my Mac Pro. Can anyone help?

I get this error sometimes. Can you click on "Connect As" right under the error, and then provide the name and password? This usually resolves the issue for me.

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