I just swapped old modem for new model. Says I'm connected but airport flashing amber and no connection. Do I have to configure a new network???

I just swapped out old modem for new model. Airport flashing amber. Wi-Fi connection good but airport not responding. Do I need to configure a new network connection? Change anything in airport utility?

Welcome to the forum!
I'm a big fan of resetting in situations like this. Who knows what boxes you've ticked where...
Use the hard reset button with a paper clip on your Airport express. Hold it til the light starts blinking, then let it reset.
While it's resetting, go into your Network prefs and make sure you're set up to connect via Airport. Delete any references to your prior wireless network in the preferred networks section. Go into your keychain utility and delete any passwords there. (this is assuming you were using some form of wireless security).
After your AE has restarted, choose it from the Airport pull-down menu and run the Airport Setup Assistant utility. Once you've got it up and running, use Airport Admin utility to set security and passwords.
Seems drastic, but after all the poking around you've done, these steps should be pretty simple to perform. I'm guessing your original "Looking for PPPoE host" was a temporary problem with your IP. Maybe the ethernet cable was unplugged from AE?
Good luck

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