If your computer is connected to the network by cable, confirm that the cable is plugged in properly. If you have a wireless network connection, confirm that you have a signal and the proper credentials for the wireless network.
If the network connection is working properly, check the following possible causes and take corrective action:
- The network is down.
- The firewall on your computer is blocking out network broadcast traffic.
- Your computer's network interface card or driver is not functioning correctly.