Restart an external device

If you have a network device, such as a hub or router, connected to your computer, and you are having problems, you might be able to correct the problem by restarting the device. See the documentation that came with the device if you don’t know how to restart it.

It often helps to wait a few minutes between turning off and restarting the device, and then wait until it has started up completely before trying to use it.

If you have multiple devices connected in a “daisy-chain” to your computer, it is important to turn off all the devices, and then restart them in sequence, starting from the device farthest from the computer. For example, if you have a DSL or cable modem connected to the Internet, a router connected to the modem, and your computer is connected to the router, turn off all of the devices. Wait a few minutes, and then restart the modem first. When it has started up completely, restart the router, and let it start up completely.

If restarting the devices doesn’t help, you may want to restart your computer. If the problem persists, use Network Diagnostics to help solve the connection problem.
  1. Choose Apple menu > System Preferences, and then click Network.
  2. Click “Assist me,” and then click Diagnostics.
  3. Follow the onscreen instructions.