IMac not Connecting to Internet on Same Network MacBook Pro Can

so, my imac decided to quit connecting the other day. it had shut itself down while i was gone (i usually have it on sleep mode in the office, using the laptop in the living room). a router connects the two to a cable modem.
the connection, hardware, and cables are all fine, as evinced by the laptop working under its own and the imac's settings/cables. restarting the imac, changing cables, changing router ports, and resetting the router and modem hasn't done anything. i would say it's an internal hardware problem on the imac, but i don't know enough about computers to say definitively; and i'm also reluctant to accept that, as there's probably some setting that was changed by the latest update, explaining why the computer had been shut down.
any help troubleshooting and getting this baby back online would be appreciated.
thanks
Message was edited by: Kick Ninja

What does the Network Control Panel status tell you?
Have you run the Network Diagnostics? (I usually don't find it useful, but can rule out some things).

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