1. Make sure the router and modem are turned on.

2. If you're using a wired connection, make sure that the Ethernet cable is inserted into the        network adapter in your computer. Each end of an Ethernet cable looks like this:

3. If you're using a wired connection, make sure the network cable is not defective. You can test    this by using a different cable that you know works properly.

4. Make sure that the cable is connected to the correct port on the router. It should not be connected to the "uplink" port. In addition, some routers disable the port next to the uplink port, so try using a different one.

5. If you're trying to connect to a wireless network from a mobile PC, make sure the wireless switch on your computer is turned on. The switch is usually located along the edge of the computer.

4. There might be problems with your network adapter. Check your local area network (LAN) connection:

• Open Network Connections.

The network icon changes depending on the status of the LAN connection, and there is information if the adapter isn't working correctly. Also, if a LAN cable is unplugged, a status icon is displayed in the notification area.

• Use Device Manager to verify that your network adapter is working correctly:

• You must be logged on as an administrator to perform these steps.

• Click to open Device Manager.‌  If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

• Expand the Network Adapters section, right-click your adapter, and then click Properties.

• Under Device status, check to see that the device is working properly.

• The network adapter driver might not be working properly. Download and install the latest version of the driver from the manufacturer's website.