My Raspberry ran for about a year and was a webserver and samba server. Suddenly I couldn't connect to the raspberry pi and ping also didnt work anymore. I flashed a new OS to the sd card but I still couldn't connect to my Raspberry Pi over SSH.
I removed the LAN-cable and flashed the SD-card again and booted it up. Look at the LEDs:
As you can see, i have no cable plugged in. And ifconfig says that there is no eth0.
Did my network module die?