Is there a fix for a dead ethernet port besides a new logic board?

My ethernet port went dead on my IMac. I unplugged the ethernet cable and plugged it into my laptop and it worked instantly. I am still able to connect wirelessly. I bought an apple USB to Ethernet converter and plugged it in. It worked for about 3 days and then it went dead. Once again I was able to unplug the ethernet cable, plug it into my laptop and instantly had a connection. Is there a fix for a dead ethernet port besides a new logic board and if not how do I figure out which logic board I need?
Thanks
Step

This problem baffled me. I kept getting the "ethernet cable unplugged" error after testing my cables good. Was abut to write it off as port gone bad when I found this thread.
The YouTube video reference above fixed my problem. (http://www.youtube.com/watch?v=u1P6X87qArs)
Basically go to SETTINGS/NETWORK. Then highlight your ETHERNET port and click the ADVANCED button. From there click the HARDWARE tab.
Set
CONFIGURE to MANUALLY
SPEED to whatever your ethernet speed is, in my case 1000baseT
DUPLEX - FULL DUPLEX, FLOW CONTROL
Leave MTU at Standard
Hit OK.
Then don't forget to hit APPLY. I didn't do this the first couple of times assuming hitting OK applied these settings. You gotta hit APPLY.
In about two seconds, my Ethernet connected again.
I went back and reset it to AUTOMATIC just to test and after doing so got the cable unplugged error again. So I am leaving it on manual and it's working.

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Is there a fix for a dead ethernet port besides a new logic board?

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