Why can t I connect to the Internet?

The network cable contact is good to see if it is good, and if it is good, find the place where you handle the broadband and let him solve it, you can test it in this order, more, be patient and take a look.

1. Has your computer been touched recently? In particular, have the ADSL modem wiring and lines been moved? Please check whether the signal light on the "cat" will flash (the cat is different, the indicator light is also different, mainly dsl, adsl, line, link, @等都是宽带信号指示灯), if you want to flash, check whether the line is connected to the pair (mainly on the separator, there are three ports, each port corresponds to a line, the connection method is the bus is the incoming line port, ** machine connected to the phone port, in addition to modem or adsl connected to the broadband cat, you can also directly connect the ** incoming line on the cat to try, This can rule out the bad separator), if the connection is still flashing, check whether the line has a joint, and the signal will not be stable if the line oxidation contact is not good (the crystal head or line of the line into the cat has a problem, which will also cause the line to be blocked.

2. Confirm that ADSL modem dialing is normal, because the IP automatically obtained by the network card is not cleared, so when dialing again, the network card can not get a new IP address will prompt 678, the operation method is: turn off ADSL modem, enter the network connection of the control panel, right-click the local connection and select disable, after 5 seconds, right-click the local connection to select enable, and then turn on the adsl modem dial-up;

3. If the first step is invalid, then in the case of turning off ADSL MODEM, still disable the local connection (network card), restart the computer, then enable the local connection (NIC), and then turn on ADSL MODEM to solve the problem;

4. If the above steps cannot be solved, check whether the NIC light is on, if the NIC light is not on, check the NIC and network cable.

5. If the NIC light is normal, step 1 and 2 cannot be solved, uninstall the NIC driver and reinstall the NIC driver.

6. If the above operation is invalid, contact the telecommunications department to confirm the port. The author also encountered the "678" error when surfing the Internet at home, and at first I couldn't check any problems, but later found that the port on the side of the telecommunications bureau was loose, resulting in the line not working.

7. There is another situation, the author has also encountered that if you have more than two computers at home, and the hub port used to connect to the computer is damaged, there will also be a "678 error", so you can replace a good port.

8. Some of the network conditions are normal after telecom testing, and there is also a prompt of error "678", at this time, it is necessary to consider the conflict of various application software in the process of use, which will also cause the network to be unconnected. For example, "Yahoo Assistant", anti-virus software, or firewall have abnormal errors that cause the error "678". So, if you find the error "678", you can try to temporarily uninstall Yahoo Assistant, exit the antivirus software, or temporarily turn off the firewall and reconnect to see if that solves the problem.

9. As a last resort, you can use the method of restarting the "cat" and the computer to see if it works.

Maybe the network cable doesn't have mushrooms.