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Diagnose NIC Problems

The Network Interface Card must be functioning for your PC to be able to communicate on a network. When network problems occur, the NIC is less likely to be the cause than infrastructure such as cables, routers and hubs. All problems below assume that you are experiencing a complete or intermittent failure of network connectivity.

Symptom

Check
Click on underlined items for further information

The cable is connected but there is no light on the NIC

  • Unplug and replug the network connector into the NIC and at the other end.

  • Check that the other end of the cable is connected to a device that is powered on.

  • Try switching the cable to a different port if available.

  • Try a different network cable.

  • Check the control panel in Windows to make sure the card is recognized and working.

The data collision light is frequently or continuously lit

  • Check that the far end of the network cable is connected to the proper port, or try a different port.

  • Check that your PC is not using an IP address that is already in use on your network.

  • Make certain that your PC is not using a name that is already in use by another PC on the network.

The lights on the NIC are normal but I cannot connect to the network

  • Make certain that other network devices are powered on.

  • Make certain that your PC is configured with the proper Workgroup or Domain name.

  • Check that your PC is not using an IP address that is already in use on your network.

  • Make certain that your PC is not using a name that is already in use by another PC on the network.

  • Allow up to 20 minutes for network polling to identify all available resources.

  • Check the network cable connections and use a different port if available.

  • If Windows is configured for more than one NIC, make certain that the correct one is being used for this network.






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