Can't connect to internet with Ethernet

I can no longer connect to the Internet through wi-fi or Ethernet.
All tests I run say I am connected to the Internet. This issued just started out of the blue when trying to connect wirelessly in my office only with the iMac, my macbook has no issues.
I contacted Comcast- they ran a bunch of tests and gave me a new modem- there was nothing wrong with the connection.
I brought it into Apple, they insisted it was my Internet connection. this went back and forth between Comcast and Apple a few times.
I contacted Comcast again, had an outlet installed so I wouldn't be wireless and could connect with an Ethernet cable thinking that maybe this was interference of some sort, it worked for a few weeks and then the other day it stopped. Again, I show that I am connected but nothing happens. I plugged in the macbook with the Ethernet and I am connecting fine.
The kicker is, I can physically move my iMac out of the office into another room and can connect perfectly through wi-fi. I am stumped
any suggestions?

Yes, if you are running 10.6.8 in an iMac purchased in 2008, it is not a PowerPC
I asked the Hosts to move it to the correct forum for you
Allan

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