IMac sees the ethernet but won't connect to the internet

we had a power outage that crashed the imac. now it won't connect to the internet. the imac can see the ethernet connection. we have several other apple and dell devices that all see the internet so it's not cabling or hardware. it's a cable modem connection that uses automatic DHCP configuration. I've created a new Location setting with no change. I'm assuming that there is a corrupted file since all the other systems connect fine. any idea which one it may be or what else I should be looking for?

Shot in the dark, but did you try an SMC reset?
SMC Reset
Shut down the computer.
Unplug the computer’s power cord and disconnect peripherals.
Press and hold the power button for 5 seconds.
Release the power button.
Attach the computers power cable.
Press the power button to turn on the computer.

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IMac sees the ethernet but won't connect to the internet

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