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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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after thunderstorm ethernet port don't work anymore

how to repair ethernet port

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If possible use the built in wireless card to connect to your network.

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Good Point! But he may not have WiFi AP setup.

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Oh wow, didn't even know this work around existed, I think this is much more of a better option to go down.

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Sounds like your ethernet port got zapped by a power surge. I had that happen once when a surge came through the coaxial cable for my cable internet service. Any ethernet port that was in use at the time got zapped and was rendered unusable. I lost my cable modem, my Apple Time Capsule, and a NAS drive. Needless to say, a lesson was learned and I now have surge protection on the coaxial cable as well as my network cables.

Anyway, as far as repair goes, the ethernet port is soldered directly onto the logic board on the iMac, and it is very difficult to replace...although in theory you could replace it with the right tools and skills. If I were you though, I wouldn't even bother with repair. Instead, I would pick up a USB to ethernet adapter like this one:

http://www.amazon.com/Cable-Matters-Ethe...

Especially since this is a desktop, the only downside to doing it this way is that one of your USB ports is constantly occupied. Of course, that could be solved by getting a USB hub. Either way, you're looking at a less than $50 cost rather than many hundreds of dollars on a replacement logic board, or attempting to solder a new one onto the current logic board which will be a lot of labor and may not even work.

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Sadly, you'll only get USB 2.0 speed doing this. Web surfing will be OK, streaming will be choppy and file transfer slow.

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Certainly a good point, and I can't argue that USB 2.0 will limit the throughput of that adapter to quite a bit under the gigabit that it's designed to allow using USB 3.0. However, I do disagree that an average user will see any effect of that lesser throughput.

Certainly web surfing won't be a problem, but I would also argue that any web based activity won't be a problem, even streaming video. I say that because most folks don't have internet access download speeds that will exceed the throughput of USB 2.0. In other words, the speed at which web activity is accessed is determined by the size of the pipeline to the internet, not the size of the pipeline to the computer via USB 2.0.

On the other hand, I do agree that any LAN activity (file transfer, streaming media from a NAS drive, etc.) could be limited quite a bit by USB 2.0. However, your average user isn't typically doing a lot of this sort of activity.

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I should also add that your comment did make me realize that a gigabit adapter is overkill, and a 10/100 adapter would do just as well given the restriction of throughput that USB 2.0 creates:

http://www.amazon.com/Cable-Matters-Ethe...

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I think you're arguing over a mole hill here ;-} It all depends on what he is expecting for throughput. I don't disagree with the limits on many internet connections are on the lean side so it might not matter in his case. But if he has local resources he is trying to use then he has a throughput pinch.

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