I installed Mountain Lion on my iMac. Now I cannot access the Internet. All the other computers and tablets have no problem. I did PRAM and MC reset, modem reset, etc., all the usual ju-ju. I also cannot connect on my local network to any other computer.

I installed Mountain Lion on my iMac. Now I cannot access the Internet. All the other computers and tablets on the network have no problem. I did PRAM and MC reset, modem reset, etc., all the usual ju-ju. I also cannot connect on my local network to any other computer. Yet Network control panel says I am connect to the modem, and Network Diagnosis says I am connected to the Internet. It's like the blind man who has eyes that cannot see. BTW, I am not some newbee. I have been a Machead since the early nineties and set up a half dozen networks, including the one I am using at home to which the iMac mysteriously is there but not. This has me stumped! I am considering going back to 10.7!

Select  ▹ System Preferences ▹ Network ▹ Advanced ▹ TCP/IP. What values are shown for the following:
Configure IPv4
IPv4 Address
Subnet Mask
Router

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