(1) First check the phone line for problems (you can dial a phone test), if normal, then check the signal crossover is connected to the normal (where the phone line to the Line port, the telephone to the phone port, ADSL Modem to the Modem port).
(2) If the signal crossover connection is normal, then check whether the ADSL Modem's "Power" indicator is on, and if it is not, check whether the ADSL Modem's power switch is turned on and whether the external power supply is plugged in well.
(3) If it is on, then check whether the status of the "LINK (synchronization)" indicator is normal (always on or blinking); if it is not normal, check whether the connecting wires of the ADSL Modem are normal (whether the wires connecting to the ADSL Modem from the signal crossover are connected to the Line port, whether the connecting wires connecting to the NIC are connected to the NIC, whether the connecting wires connecting to the NIC are connected to the NIC. Network card connecting cable is connected to the LAN port, whether it is plugged), if the connection is not correct, reconnect the connection cable.
(4) If it is normal, then check whether the status of "LAN" or "PC" indicator is normal. If not, check whether the LAN port on the ADSL Modem is connected properly; if it is connected properly, then test whether the network cable is normal; if it is not normal, replace the cable; if it is normal, turn off the computer and the ADSL Modem for 30 seconds, and then turn on the power of the ADSL Modem and the computer again.
(5) If the problem persists, then click "Start/Control Panel/System/Hardware/Device Manager" command, open the "Device Manager" window, double-click the "Network Adapter" option, open the "Network Adapter" option, double-click the "Network Adapter" option, open the "Network Adapter" option, double-click the "Network Adapter" option, open the "Network Adapter" option. " option, open the "Network Adapter Properties" dialog box, and then check whether the network card is a conflict, whether or not to enable, if the network card has a conflict, adjust the interrupt value of the network card.
(6) If there is no conflict on the NIC, then check whether the NIC is normal (whether it has poor contact, aging, damaged, etc.), you can use the replacement method to test, if not, repair or replace the NIC.
(7) If the network card is normal, then in the "Online Neighborhood" icon on the right mouse click, in the open shortcut menu, select "Properties" command, open the "Local Connection Properties "dialog box. In the "Local Connection Properties" dialog box to check whether the "Internet Protocol (TCP/IP)" option. If not, you need to install the protocol; if so, double-click this item to open the "Internet Protocol (TCP/IP) Properties" dialog box, and then check the settings of the IP address, subnet mask, DNS, usually set to "Obtained Automatically "
The Internet Protocol (TCP/IP) Properties dialog box.
(8) If the network protocol is normal, the other aspects of the failure, then check the network connection settings, browser, PPPOE protocol and other aspects of the failure.
Troubleshooting methods for LAN without Internet access
The diagnostic methods for a single computer on a LAN without Internet access are as follows:
Step 1: First, determine whether a single computer can't access the Internet or all the computers on the LAN can't access the Internet. If a single computer can not access the Internet, in the Windows XP/2000 operating system, click Start/All Programs/Accessories/Communications/Network Connections command, open the "Network Connections" window (you can also right-click on the Internet Neighborhood icon and select "Properties" command),
The first step is to determine whether a single computer can not access the Internet or all the computers in the LAN can not access the Internet. "
Step 2: Next, check the status of your local connection. If the icon of the local connection is two small computer flashing, prompting "connected", which represents the line from the switch HUB to the computer is normal, the network card can basically work properly, can not access the Internet is due to improper operating system settings or software limitations and other reasons. Ping command Ping remote host, to see if you can Ping through, if you can Ping through the network connection is normal, then check the computer's firewall settings, proxy server settings, and so on.
Step 3: If you can't get through the Ping command, it may be a network protocol configuration problem. Check your computer's IP address, gateway, DNS and other configurations.
Step 4: If the local connection icon in the Network Connections window is grayed out, it means that the local connection (NIC) has been disabled, so you just need to double-click the local connection icon to re-enable it.
Step 5: If the local connection icon in the "Network Connections" window prompts "Local cable unplugged", it indicates that the cable connector from the switch or HUB to the user's NIC has a loose end or a problem with the cable, then check whether the cable is in good contact. Then check whether the cable is in good contact, and if so, check the cable.
The switch or HUB has been disconnected from the user's NIC.