Airport Card / No Internet

I'm having airport problems with my Mac Pro 2008 2x2.8GHz. Im running an Airport Express G router, and it seems to be working semi-properly - my ipad and iphone can connect to the network/Internet no problem.

When the Mac Pro attempts to connect, half of the time it has a connection time-out, and half the time it connects to the network no problem, but zero internet. The airport extreme card is recognized properly under system profiler, and ive never had a problem with it.

Also, the airport express is no longer viewable in airport utility, except very rarely, always showing up as 'green', and no problems connecting to the internet with other devices.

I also tried deleting cache files to no effect...

It's hard for me to determine whether or not its the Mac Pro without another Macintosh to run airport utility from.

I have signed in as other users with the same results, so it doesn't appear to be any preferences... And as a result, ive had to type all this on the iPad! : )

Message was edited by: Psilocybe