A few days ago my Raspberry Pi 2 was working perfectly, but today I turned it on and it said "no wired connection" even though my ethernet cable is connected. I tried various things such as rebooting the router and restarting the Raspberry Pi but none of that helped me.
Well if we want to go bug hunting try eliminating possibilities;
- Save your image, reinstall Raspbian and check if your connection works now.
Problem about your Software, ask yourself if you've installed or uninstalled anything just before your last reboot.
- Problem about your Hardware or Internet connection, try another cable, does it work now?
Get a new cable.
You might have fried your Pi, from this on it gets more tricky to find out what happened.