Airport Extreme/Express/Ethernet issue

[Phish311]

So it took a while, but i now have an airport extreme and an airport express in my house running two different networks. In order to get this going, i had to change the channel on which the wireless connects. My issue now, is that when i have both these networks going, if i plug my older ibook into the wall directly (my house is networked), it will not connect to the internet. There is an amber light under network connections that says the ethernet has its own IP address and cannot connect to the internet. I have tried resetting the modem, router, and all sorts of other troubleshooting methods but cannot figure this out. Any help would really be appreciated

 

[Phish311]

anyone?