Intel 82579V gigabit network connection is not working. I have updated BIOS and reinstalled the network drivers but didn't solve the problem.
What Windows version are you using?
If you check the device manager do you get any exclamation marks under network adapters? If yes, try reinstalling the LAN driver, you can download the driver here:
https://downloadcenter.intel.com/product/59505/Intel-Desktop-Board-DH77EB Drivers & Software