Apple iMac (21.5-inch, Late 2011) - Manual (Page 50)

50 Chapter 4 Problem, Meet Solution
Problems with Your Internet Connection
The Network Setup Assistant application on your iMac can help walk you through
setting up an Internet connection. Open System Preferences and click Network.
Click the “Assist me” button to open Network Setup Assistant.
If you have trouble with your Internet connection, you can try the steps in this section
for your type of connection or you can use Network Diagnostics.
To use Network Diagnostics:
1 Choose Apple () > System Preferences.
2 Click Network and then click “Assist me.”
3 Click Diagnostics to open Network Diagnostics.
4 Follow the onscreen instructions.
If Network Diagnostics can’t resolve the problem, there may be a problem with the
Internet service provider (ISP) you are trying to connect to, with an external device you
are using to connect to your ISP, or with the server you are trying to access. You can try
the steps in the following sections.
Cable Modem, DSL Modem, and LAN Internet Connections
Make sure all modem cables are firmly plugged in, including the modem power cord,
the cable from the modem to your iMac, and the cable from the modem to the wall
jack. Also check the cables and power supplies to any Ethernet hubs or routers.
Turn off your DSL or cable modem for a few minutes, and then turn it back on. Some
ISPs recommend that you unplug the modem’s power cord. If your modem has a reset
button, you can press it either before or after you turn the power off and on.