iMac Ethernet Problems

After a electrical storm in which my router/modem ethernet port stopped working on my iMac which I tested with a laptop to narrow down to the router/modem or Ethernet cable. ISP provider lost 25%of the packet they sent so they came out and replaced the router/modem and cable. This worked for the laptop but not the iMac. To test the port after turning firmware password off, unplugged everything but the Ethernet, turned on computer and pressed the "d" key for diagnostics which passed. Then I deleted my home WiFi from preferences, turned the WiFi off, restarted the computer holding down option, command, r. Only the WiFi option came up which I was told, confirmed the Ethernet port was bad. To circumvent this I bought a Thunderbolt to Gigabit Ethernet Adapter and plugged it into the Thunderbolt port 1 (next to the ethernet port). At first this didn't register but the Ethernet port on the router/modem lit up. Tried adding Thunderbolt and finally just plugged the Thunderbolt into port 2 and a Thunderbolt Ethernet connection appeared in my system preferences-->network window. This really seems to be much faster as far as loading pages than the Ethernet port to Ethernet port connection. Well worth the $29.00 for the adapter Model A1433.

Someone on here recently had problems with an ethernet port that stopped working. I believe an SMC reset seemed to fix it.

SMC Reset

1. Shut down the computer.
2. Unplug the computer’s power cord and disconnect peripherals.
3. Press and hold the power button for 5 seconds.
4. Release the power button.
5. Attach the computers power cable.
6. Press the power button to turn on the computer.

Thanks - let us know how you get on.