My computer can t connect to broadband, and my computer doesn t have a broadband connection

678 is the network is not working, if there is no problem with other changes, then it is a problem with your desktop network card, it is recommended to plug and unplug the network card, and try again.

In Device Manager, uninstall the network card and reinstall the driver.

Error 678 occurs, if the line is fine, most of the time it is due to a faulty network card.

Check to see if there is anything wrong with the Internet ID and password.

Open the Network & Sharing Center, set up a new connection or network, and you're ready to get your broadband connection back on.

You can re-establish a broadband connection! First click on the Internet browser right-click, select Properties, find the connection in the horizontal item, click on it and select Establish Connection, the next step is to select Connect to the Internet, continue to see if you are ADSL or broadband direct connection I don't know.

There are many aspects to this question that should be checked first.

Whether your account number and password are correct, turn the net.

The card is disabled after three minutes, enabled. Two look at you.

The DSL light of the moden is always on, or is it constantly flashing. If it doesn't stop.

In the flash, power off the moden and take a look.

Still flashing. If this is still the case.

Give Telecom a **.

1. Go to the network connection and find Local Connection, see if you have disabled it, if it is disabled, right-click to enable it.

2. Look at whether the light of the corresponding port of the network cable is always on or flashing, if it flashes, cut off the power of the computer and router, and then unplug the network cable and plug it back in, and then power it on, which can generally solve the problem.

3.There is a problem with the network card driver, and the driver wizard is lower. (Query method: my computer - right click - properties - device manager - see if there is a triangle or something on the side of the network card).

4.There is a problem with the network card, indicating that there is no network card at all.

Put the system from a little bit on it,

Solutions to computer wireless network connection problems.

Method 1: First try if other networks can connect. If the password is incorrect, delete the network and enter the correct password. If you can't connect, use the system's own tools to fix the problem.

1。Right-click on the network icon and select Troubleshoot, and the message will be displayed automatically.

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2。Wait for the problem to be resolved or give a reason why the network is not connecting.

Solve the problem that the computer wireless network cannot be connectedFigure 2

Method 2: Update the drivers.

2。Right-click on the computer icon and select Manage.

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2. Select Device Manager, find the network adapter on the right side, find the wireless network card device after opening, check whether the driver has a yellow exclamation mark, right-click to select Update Driver (you need to connect the computer to the Internet, you can plug in the network cable).

Solve the problem that the computer wireless network cannot be connectedFigure 4

Method 3: Reset IP with Command

1。Right-click on the Start menu and select Windows PowerShell (Administrator).

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2。Open the Administrator Command window and enter the command to clear the DNS cache: ipconfig flushdns

Solve the problem that the computer wireless network cannot be connectedFigure 6

3。Then type: netsh winsock reset catalog Note: reset winsock directory.

What to do if you can't connect to a wireless networkFigure 7

4。Last input: netsh int ip reset Note: reset ip. Restart your computer after completing the steps above to fix the problem.

Solve the problem that the computer wireless network cannot be connectedFigure 8

Hello, I'm glad to answer your question, if the computer broadband connection is not available, it is generally caused by these reasons. 1.It may be because of the arrears of broadband bills, as long as you re-pay the bill.

2.It may be because the network cable is loose, just unplug the network cable and plug it back in. 3.

If there is a problem with the optical modem, you can contact the operator of the network cable and ask the staff to solve the problem of the broadband connection.

1. Desktop-right-click [Network] or [Online Neighbor] - click [Properties]. 2. Click [Change Adapter Settings] and a pop-up window will appear. 3. Delete the original [Broadband Connection] icon, click the back button, and click [Set New Connection or Network] in the window.

4. In the pop-up window, click Connect to the Internet, and click Next. 5. Click Broadband (PPPoE) (R). 6. Enter the username and password.

There are many reasons why broadband cannot be connected, first check whether it is the computer or the network.