Ethernet connection to iMac has failed

I have 4 year old iMac running Yosemite and connected via ethernet to a Verizon Fios router. All has functioned well until yesterday when the ethernet connection failed. I can still connect via wifi if I unplug the ethernet cable. With the cable plugged in I get a yellow indicator for both ethernet and wifi. Unplugging the cable lets the wifi signal to turn green and connect.
What is wrong with the ethernet connection and how do I test and fix it? I tried another cable which did not fix the problem.
Thanks, AHCMac

When the ethernet is plugged in does the connectivity light go on.. at least on the router.. Macs are not sophisticated enough to have connectivity light I guess.
Do you have anything else in the house connected by ethernet?
Or something you could test and prove the issue is Mac not router??
If the Mac is the issue.. go to the ethernet configuration .. give me a couple of screenshots.
Try setting the speed down.. by changing to manual configuration.. and set to 100mbit or even 10mbit..

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Are you certain that you have a router?
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Can you explain what you meant by your last paragraph?
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Hi lukioxx!
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http://support.apple.com/kb/ts1717
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