I can't stay connected to internet. I've changed my location. Same thing. All my other devices are working fine. How can I get my iMac back online?

I am unable to connect to the internet.  WiFi, ethernet all working fine. Multiple devices can connect to the internet. Diagnostic on iMac says I'm connected and should be able to access the internet.  This is all beyond me.  I've changed the location, it appeared to set every thing up. Still doen't work. It must be corrupted so how do I clean it up?

Power Cycle
Power off the router. Unplug it from the wall. Wait for few  minutes.
Connect the router back to to the wall.
Power the router back on. Wait  until all lights are lit properly. It will take a while.
Restart the computer.
Start up in Safe Mode.
http://support.apple.com/kb/HT1455

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    ~~~~~~~~~~~~~~~
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