Ethernet port doesn't work anymore I was using my iMac 27" 2010, doing some work online. From one instant to another, internet stopped to respond. Unable to ping the local router, I initially believed it crashed. However, the rest of my home network was fine.

I'm now forced to use a WiFi connection to connect to the internet. Tried to boot Windows, it dosen't detect the wired network connection too.

A bad way to be forced to change a 1500€ machine.

What do you suggest?
Have you tried to reset your network settings to default?


Turn off your WiFi and unplug all network connections
Go to /Library/Preferences/SystemConfiguration
Take a backup of the preferences.plist by renaming the file to preferences.plist.bak (just in case)
Reboot and a new preferences-file will be automatically recreated


... and by so your network settings will be restored to the default.
Don't worry, it's all about settings, not stored data (like names of networks) will be erased.