New 27inch imac ethernet not working!

About to return it to the apple store.
Wi fi rock solid
Ethernet gets IP address
All green lights on
diagnostics says all good
new ethernet cable
but imac refuses to connect to anything via ethernet!
tried router with mac book and ethernet is brilliant and solid
Anyone had this or got any ideas?
Thanks
Gary

Thanks for your quick response. I had another look at the addresses-sorry my mistake they are slightly different
wi fi192.168.0.3
ethernet 192.168.0.2
I have tried turning of wi fi -it made no difference.
I'm running out of ideas.
Gary

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