IMac stopped recognizing my Internet connection (ethernet) after announcing an IP address conflict (all of a sudden, after 6 years). How can I get the whole network settings part back to default and start over?

I had no trouble getting on line until last week when a message came on that
IP address 192.168.0.139
was in use by
04:0c:ce:54:c1:e5 
DHCP Server 192.168.0.1
Since that time, no matter if I plug it into one router or the other  (I use a router in my office to share the one ethernet cable that comes down the hall) it claims that the ethernet is working and it knows that it is connected to the Internet,but it cannot access the Internet. IT seems to be stuck in a cycle of navel-gazing, constantly focused on its own ethernet IP address.
All I know how to do is operate the thing; we have no IT person here. A visitor set up our network for us a few years ago. Only the iMac has this problem; my PC laptops go online just fine. But all my work is on the iMac.

First thing to try is renewing the DHCP lease.
System Preferences > Network.
Do you have a green dot next to Ethernet? If so, with ethernet selected in the left pane;
Check the location is set to 'automatic'
Check 'configure IPv4' is set to DHCP
Click the 'Advanced' button
Check that DHCP is selected in that window for IPv4
Turn off IPv6 (gives a conflict on some routers)
Click the button 'renew DHCP lease'
That should persuade the router to give you a different IP.

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