Verizon | High Speed Internet - Troubleshooting Your Network Interface Card (NIC).

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Networking

Troubleshooting Your Network Interface Card (NIC). One end of the Ethernet cable (RJ-45 cable) that came in your installation kit should be connected to your modem, while the other end should be connected to the Ethernet jack in the back of your computer. If you have a laptop computer, the Ethernet jack may be on the side of your computer.

Figure depicting

Typical Ethernet Connection

The Ethernet jack in your computer is part of your Network Interface Card (NIC), also known as an Ethernet adapter. If the Ethernet cable is plugged in and your computer is on, you should see a green light next to the Ethernet jack.

If you cannot access the Internet and the light is off:

Make sure that your computer and modem are powered on.
Make sure that the Ethernet cable is securely plugged into the Ethernet jack in your computer, and the other end is plugged into the modem. Ethernet cable connectors have a spring clip that will click when the cable is connected securely.
Check to see if your computer is connected to a network hub or a router. If it is, you may need a crossover Ethernet cable, rather than the straight-through Ethernet cable that came in your installation kit.
Restart your computer and test again.