Cannot connect to internet with Ethernet cord

Is this a desktop or laptop. 

I am assuming the modem/gateway has other Ethernet ports. Have you tried attaching the Ethernet cable to a different port on the gateway or Wifi router if you have a separate modem/router.

Try the following steps in order if the previous does not work.

Powercycle the computer by pulling the power and main battery if a laptop and it's easily accessible. Hold the power button down for 30 seconds. Attach the main power and battery. Reboot and see if you can connect.

Open a command prompt and type the following commands

netsh winsock reset
netsh int ip reset c:\resetlog.txt

Reboot

Download Windows Repair and only check the Network Repair box.

Depending on how you wish to connect, ethernet or wifi, and whether the computer is a desktop or laptop would depend  on what device to purchase.

You can use a Wifi USB dongle or Wifi PCIe card if a desktop. For Ethernet a PCIe LAN card or USB to Ethernet adapter can be used but for faster speeds a USB 3 port is required.

Edited by CJ1431, 04 December 2016 - 12:22 PM.

Also check for any yellow exclamation mark next to your Network Adapter in Device Manager.