My AirPort Express was successfully set up, but internet won't connect.

I recently purchased an AirPort Express to be used as the main source of Wi-Fi in my home. I followed the instructions in both the manual and on the computer to set up a new network, and the AirPort set up successfully and lit up green. Only problem is that when I tried to connect to Safari and Mail, it said there was no internet connection, even though it recognized the network. When I went to change the settings, it said there was no valid IP address. I've tried this on 3 different computers, resetting it for each one, and got the same results every time.
If you have any ideas to what could be causing this and how it could be fixed, could you please help?
Thanks.

TomK32 wrote:
I'm currently connected to the internet from a broadband cable modem, as are the other computers I tried this on.
Whenever you connect something different to a cable modem, they usually have to be power-cycled for the change to be recognized. It wouldn't hurt to reset everything else while you're waiting.
Here's what Tesserax usually says in this sort of situation:
It's always a good idea to perform a complete power recycle of your network components when changing configurations.
Please try the following:
o Power-off the broadband cable modem, AirPort Express Base Station (AX) and computer(s); Order is not critical. Leave all off for at least 10-15 minutes.
o Power-on the cable modem; wait at least 10 minutes.
o Plug-in the AX; wait at least 5 minutes.
o Power-on the computer(s).
Your Express should be configured to connect via Ethernet, configure IPv4 "via DHCP", and connection sharing should be set to "share a public IP address" which will distribute individual IP addresses to your computers.
It should go without saying, but also be sure your computers are all connected to your Express's wireless network (under the "fan" icon in the menubar), and that their network port configurations are correct - if all this doesn't make sense to you, reply for more help.

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My AirPort Express was successfully set up, but internet won't connect.

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