Ethernet Connected - Internet Doesn't Work

Last night my internet was working perfectly. I was using all of my web applications with ease. I took out my Ethernet cable to plug in to my PC laptop (which worked perfectly than as well), but when I put it back into my iMac this morning- nothing. It recognizes that the computer is connected via Ethernet, but I can't load a page on Safari, Firefox, or sign in to any other internet based program.
There are two other new iMacs connected by Ethernet and working fine on this network.
Does anyone know how to solve this issue? It's rather frustrating.
Thanks

I have done a Restart on my Mac, as well as a full shut down. I've also reset my router... still nothing!

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