I installed an Extreme in place of an old Express, the various phones and Ipads seem to work on the WiFi but the Mac itself will not connect.  It says something about the IP address.

I installed an Extreme in place of an old Express, the various phones and Ipads seem to work on the WiFi but the Mac itself will not connect.  It says something about the IP address being used by another device.  Second wifi network was also created.  The Mac worked for a few minutes and then gaev up citing eth IP problem......any clues people??

If you have not already done so, now would be a good time to perform a complete network power cycle.......to give everything a fresh start.
Power off every device on the network.....computers, printers, hard drives, etc......in any order that you want
Wait a full minute
Start the modem, and let it run by itself for 2-3 minutes
Start the next device connected to the modem and let it run a full minute
Keep starting devices one at a time about a minute apart until the entire network is back up
Check the network

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