IP Address Is Duplicate and iPhone Won't Connect

Everything was working for last 2+ years, then my modem died yesterday. I replaced it, but can't get back to where I was. I ended up restoring network to factory settings and then doing connection.
I have AT&T DSL service. When setting up the connection with my AirPort Extreme, have Ethernet with Bridge Mode. I receive message that "another device on the network is using your computers IP address." I didn't have this issue when setting up 2+ years ago. So, I manually changed the IP address, but this caused a message about DNS not being correct, which I ignored, because this at least gave me access to Internet, and I didn't have to "borrow" from one of my neighbors unprotected networks. I have implemented WPA2 security (which I had prior to this also).
Issues I now have are:
- iPhone won't connect, and it did before all this
- HP Photosmart printer (which is wireless) also won't connect, as it did before
I assume that all my issues are from not configuring correctly, and that it revolves around the IP address conflict.
Any assistance?

You need to do a Factory Default Reset on the AirPort Extreme (AEBS) to clear out all the old settings and IP conflicts.
Pull the power plug on the AEBS
Hold in the reset button and while you continue to hold it in, plug the power back in to the AEBS
Release the reset button after 10 seconds.
Open AirPort UTility and set it up again to Create a wireless network.
It's easiest to click Continue and follow the guided setup.
Ignore the Double NAT message when/if it appears.
I know this works. I have the exact same equipment on my desk now.
Message was edited by: Bob Timmons
Message was edited by: Bob Timmons

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