Question about Network & Wireless Adapters

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My lan/modem card wont give me the led light even after a cable is connected.

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  • Anonymous Jan 19, 2009

    I still have the same problem or is it that the card is bad and needs a replacement?


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  • 24 Answers


Is it connected to a router that is on and working? Have you tried connecting with another network cable?

Posted on Jan 19, 2009

  • Asaph
    Asaph Jan 21, 2009

    1. start the troubleshooting process by making sure that everything (routers,
      switches, hubs, modems, and computers) is firmly
      plugged in.

    2. If your computer is on and the other end of the Ethernet cable is
      connected to a network device, the link or activity LED should light.
      If the light remains dark after you plug in the cable, replace the
      cable. If replacing the cable gives the same result (no green light), then go to the next step.

    3. Once you’ve eliminated cabling as a source of the problem, it’s time to
      look to your computer. Start by making sure that your computer is able to
      access your Ethernet card. A good tool for doing this, and subsequent
      network troubleshooting, is the command prompt.

    4. Select Start, All Programs, Accessories, and then Command Prompt. When the Command Prompt window opens, type ipconfig –all
      and press ENTER. Various lines of information will display, depending
      on how your system is configured. Look for a section labeled Ethernet
      Adapter Local Area Connection. This section should include a line
      labeled Description, which should be a description of your Ethernet
      card. If you see it, then your computer knows about your Ethernet card
      and has successfully loaded the necessary drivers. If the Description
      line is blank or missing, you will need to reinstall the drivers for
      your Ethernet card.

    5. Your Ethernet card doesn’t detect a connection to the Ethernet cable. Open a command prompt, type ipconfig –all,
      and press ENTER. If the section that starts with Ethernet adapter Local
      Area Connection contains a line labeled Media, with a status of Media
      Disconnected, then your computer is unable to detect that a link has
      been made from your Ethernet card through the Ethernet cable to another
      network device, such as your computer or router. Recheck the cabling.
      Use a known good cable to connect your computer to a known good network
      device and then perform the check again. If the status is still Media
      Disconnected, and you are sure that the cable and the network device
      the cable connects to are good, then you may have a bad Ethernet card.
      Reinstall the Ethernet card. If the problem continues, you may need to
      replace the card.

    6. Other things to check:

    7. Bad connection, bad cable, or wrong cable. The ports on a
      router, hub, switch, wireless access point, and print server can, like
      any other device, go bad. However, the most common problem is not a bad
      port but a bad or loose connection, a bad Ethernet cable, or the wrong
      type of cable. Refer to the Cabling section above, to eliminate these

    8. Wrong port. One possible cause of Ethernet port problems is
      using the wrong port on a network device. For example, routers have WAN
      (wide-area network) and LAN ports. These ports accept the same Ethernet
      cabling but are not interchangeable. The same is true of hubs and
      switches that have uplink ports, which are specially wired LAN ports
      that allow easy cascading of multiple hubs and switches. In some cases,
      the uplink port is also a normal LAN port controlled by a switch on the
      device. If you’re using the uplink port as a normal LAN port, make sure
      the device is configured properly for this type of use.

      If a
      port doesn’t appear to be working, you can use the link light to
      confirm it. Port link lights should always be lit when a good cable is
      connected between the port and another working network device. If you
      use known good cable and a known good network device to test the port
      but the link light isn’t lit, you may have a bad port. You can either
      replace the network device, or in the case of a hub/switch, add a hub
      or switch to gain more LAN ports.

    9. You cannot connect to other computers or router/Internet. When
      other computers in your LAN can connect to each other, as well as to
      the Internet or other services, and your computer cannot, this may be
      an indication that your computer did not receive an IP (Internet
      Protocol) assignment when you booted.

    10. Open a command prompt, type ipconfig –all, and press ENTER. In
      the section labeled Ethernet adapter Local Area Connection, look for
      the line labeled IP. If it starts with 169, you have a self-assigned
      IP, which indicates that your computer was not able to acquire an IP
      assignment from the DHCP (Dynamic Host Configuration Protocol) server.

      Test your access to the DHCP server by using the ping command. Open a command prompt and type ping
      followed by the IP address of the DHCP server. Your DHCP server is
      probably the same as your router. For example, if your router’s IP is, then type ping and press ENTER. You
      should see four lines of text, starting with Reply From
      Bytes 32, followed by time values that indicate how much time elapsed
      between the ping command and the router’s response. If you see four
      lines that say Request Timed Out, then your computer cannot reach your
      router/DHCP server.

      Make sure the router is plugged in,
      turned on, and properly configured to provide DHCP services.
    These are just a few things to try to help figure out if it is your cable, ethernet card, router, or some other problem.


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