1, first in the computer to open the network connection to see whether the NIC has been started or disabled, click the "Start"-"Control Panel."
2, in the "Control Panel" select "Network and the Internet", click "View network status and tasks."
3. Click "Change adapter Settings" in the Open page.
4, to see if the network card (that is, local connection) has been disabled or no network adapter, if the local Area connection (NIC) is disabled, right-click "Local Area Connection" and click "Enable" in the pop-up dialog box to open the local connection, if "Local Area Connection" is not visible, or if the system does not detect a NIC, or if the NIC driver is missing, or network card is damaged, not detected and Nic Drive lost general Restart the computer can be automatically installed, network card damage to replace the network card, integrated network card damage and then install a separate NIC on the line.
5, to confirm that the network card is enabled, but not even on the router, then click "Start"-"Run" "cmd" return to open the command line manager.
6, enter "Ping 192.168.1.1" that is the router IP address (general router default address is 192.168.1.1), enter, if appear as shown in two cases, the instructions have not been linked to the router.
7, first check the router is not started, and then check the network cable connectors have been oxidized or have been plugged in well.
8, back to ping the router, if appear as shown in the signal response is connected.
9, if the above two are not connected ping, you can restart the router, the network cable connectors, and then another person's router to try their own router is not damaged, if the damage is replaced.