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Can you communicate with other computers on your LAN? Try pinging another computer. If so then it isn't a hardware problem.
If not then does the link light on the switch indicate the correct link mode i.e 10/100/1000? Look at the output of the command ethtool. Should match link mode, full duplex.
as suggested have you tried swapping cables to a know good port on the switch?
Have you Restarted the computer or restarted networking?
I missed Frank Bell's post yesterday while I was going from one computer to the other trying to type the output (thanks for the .txt tip), but when I read Michael's this morning, was getting ready to do the swap to a known "internet good" computer when I tried pinging the router and got a reply (yea!).
Had restarted the computer twice yesterday and the second time had not restarted my browser, so when the ping worked this morning, I opened the browser and lo, it reached the internet. Very strange. I expect that I now have an intermittent problem, but hopefully that will be a one-time event.
Expect me back, but in the meantime, thanks for all the great help!