Ethernet port not connected - airport working - not able to get online

Hi, new poster. Never had an issue with our beloved iMac 20 inch Intel Core 2 Duo 2.16 GHz - 2GB 667 MHz DDR2 SDRAM. It's old but it serves us, we hope it's not shot. Power goes out a lot here, system has surge protection but no battery backup. System just goes down without being shutdown properly. We used wired Ethernet. No the problem. Last time power just went out, the system would not boot up. I searched around and found out to use the DVD to verify/repair disk. It finally did and system now boots up. However, it says the Ethernet is not connected. It is. I tried three different cables that worked with our laptop and two different routers, all that happens is the light on the router flashed on and off. While on the network status in sys pref displays no cable detected vs. Cable connected but not connected to internet. Assumed the port was shot. OK, turned on the airport. Connects, gets DHCP assigned IP address and/or accepts static IP but when we launch Safari says it can't connect. Tried Opera browser, same thing. Sophos AV also can't connect for updates. All these network configurations had worked previously until this last power outage. Searched for help, as I don't want to waste peoples time. Found out about these things that follow: SMC RESET - PRAM RESET - Delete connection and recreate same - Network Diagnostics - Hardware Diagnostics - Verify & Repair disk ••• Nothing makes it connect to Internet. Network diagnostics gets to end but will not get connected. Hardware diagnostics regular and extended report no issues. We think the logic board is shot given everything we tried and symptoms with system. Can anyone suggest something we did not try of the things we did listed above? Please help us save this thing from the recycling center. Thanks in advance. Sorry for the long post, wanted to be thorough with what's going on and what we have already tried and done thanks to searching these forums for the last week.

Yikes, sounds like big problems!
Have you blown the dust out lately?

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