No internet access with iMac

I have an Intel iMac. I have cable internet through Comcast. About a week ago I started getting "server not found" messages while loading pages, but if I clicked refresh the page would load. This occurred with Safari, Firefox and Internet Explorer. Then two days I couldn't load any pages, use Google earth, download software updates, etc. I called Apple and they said it was a comcast problem, but they came out today and hooked up a laptop and got an internet connection and later I hooked up my old pc and got an internet connection, which I'm using now. So the modem's working fine. The firewall is off. The comcast tech guys said they'd never seen anything like it and tried all the network preference settings. Something is not allowing the iMac to communicate through the modem to receive data off the internet. They said there's some kind of issue with assigning the right IP addresses.
Has anyone experienced or heard of anything like this and know of a fix?
Greg

I tried restarting everything (turned everything off and unplugged all cords from outlets) and it still doesn't connect, but oddly I get different results from network diagnostics and network status. In diagnostics I get:
Built in Ethernet -- green
Network settings -- green
ISP -- green
Internet -- red
Server -- red
And the message: Cannot find server. This computer appears to have a working internet connection, but cannot find apple.com. You may have typed the address incorrectly.
Network status reads: Built in ethernet is currently active and has the IP address xx.xxx.xxx.xx (note, I did get numbers but didn't want to publish them in case that's a security risk). You are connected to the internet via Built in Ethernet.
So, it appears the ethernet port is working fine, but something else is lost in translation between the modem and the ethernet card.
Greg

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