If the light on the back of your computer (next to the Ethernet cable connection) and/or the light labeled "PC" on your cable modem is out while your PC is on and your operating system loaded, your network card may not be functioning correctly.
To troubleshoot your cable modem connection, try the following:
Verify that the Ethernet cable (also called "RJ-45" network cable) is properly plugged into both the cable modem and to the back of your computer. The Ethernet cable looks like a slightly enlarged phone cord. If the cable looks securely plugged in and the light on the back of your computer or your cable modem is still out, try reconnecting the cable at both ends.
Try running the diagnostic program that came with your network card, if available.
Reset or powercycle your cable modem.
Shut down and restart your computer.
If the above still does not solve the problem, please contact customer care.
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