Built-in Ethernet card can not be found
Built-in Ethernet wired network card can not be found, so I can not log on APP STORE, there is no way to solve it?
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Sadly, the Ethernet hardware is part of the main logic board. So you'll need to replace the logic board if you want to repair it.
But you do have a few connectivity options here!
First you do have WiFi so you could try setting up a WiFi access point (AP) 802.11n.
Your other option is using a Ethernet USB dongle the only rub here it's very slow and they are hard to find one that works with OS-X.
Then there is always sneaker-net. Use a second mac to access what you want and download it to a FireWire or USB drive and then carry over the drive to your system to then copy over the files.
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