Why can one mac access the internet and not the other?

Hi I have just installed a 2nd generation Airport Express base station. I have setup a network and I can connect to it to access the web. Here's the rub, only my Macbook Pro can connect. My Macbook Air cannot connect? A weird error message says (translated from Swedish): Airport has the selfapplied/selfselected IP adress 169.254.67.130 and will not be able to connect to the internet.
Why can one mac access the internet and not the other? Is there something simple that I can do to get more macs to be able to use my Airport Express to access the internet?
Tech details:
Airport Express 2nd generation (just purchased) model 1392
Macbook Pro running 10.8.2
MacBook Air running 10.6.8

It seems the Airbook assigns a dummy IP address so somehow it doesn't reach and receive an IP from the Express. I deleted the previous Express setting restarted the Air connected again, restarted the modem, restarted the Express nothing....
I spoke to the internet provider and the cable modem does not require any username or pw. from the modem to the cable it's one public ip, pure internet is flowing from the modem to the Express but the express doesn't seem to assign any IP address apart from the one assigned to the Macbook Pro.
Do you need a screendump of the settings on the functioning Mac or the faulty one? What settings are you interested in i.e. which tab should it shot?

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