Check external devices

If you are using an external networking device, such as a hub or a router, and are having trouble connecting to the Internet, there may be problems with your devices or cables.
  1. Check that all the devices you are using are turned on and have started up completely.
  2. Make sure all cables related to the modem are plugged in and firmly inserted. This includes the modem’s power cord, the cable from the modem to the wall jack, and the cable from the modem to your computer. To be sure a connector is properly inserted, disconnect and reconnect it. Be sure that cables have not been cut, chewed, or otherwise damaged.
  3. If you are using an Ethernet hub, router, or gateway, make sure all cables and power supplies are properly connected. If you have more than one power supply available for a type of hub or router, try switching the power supplies. A defective power supply may affect network traffic.
  4. Turn off the power on your DSL or cable modem for a few minutes, then turn it back on. Some service providers recommend that you unplug the modem’s power cord to turn off power to it. This is required if the modem does not have a power button. If the modem has a reset button, try pressing it before or after unplugging the modem and plugging it back in.
  5. Check the indicator lights on the modem. Some DSL and cable modems have indicator lights that provide useful information about the modem’s connections. A “cable” light may indicate that the cable network is available, whereas a “PC” light may indicate that the modem recognizes the connection to your computer. If such a light remains off after you have checked your cables and turned the power off and on, check the documentation that came with the modem, or contact your Internet service provider (ISP).
If you use one or more devices, such as a DSL or cable modem and a router to connect your computer to the Internet, try turning off all the devices, waiting a few minutes, and then turning them back on in order. Turn on the device closest to the Internet connection first, let it restart completely, and then turn on the next device.