Make error at startup on another device using my IP address

The last 2 weeks, I get this error message when I start up my Power Mac, "another device on the network use the IP address of your computer."  When I go to the network window in system preferences says Ethernet is connected, but all DCHP info is empty.  I never got this message before and even if I can use this computer using wifi, I prefer the wired connection.  How can I correct this situation?

Thank you!

Is something on the network using IP static?

Tags: Mac

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