There could be several reasons why you are not able to access the internet after installing a new network card.
The first and most likely cause is that you did not correctly install the driver for the new card. Without the proper driver installed, the computer won’t be able to recognize and use the new card. In most cases, the manufacturer of the card will provide an installation CD or download that contains the necessary drivers you need. Make sure to read the instructions and follow them carefully to ensure the proper installation of the driver. You can also check the device manager on your computer to make sure the driver is installed and working properly.
Another possible reason could be that your new card is not compatible with your system. Not all network cards are compatible with all systems so it is important to check compatibility before purchasing a new one. If your card is not compatible with your system, you will have to find another card that is supported.
It is also possible that the network card is damaged or faulty. If this is the case, the card will have to be replaced before you can access the internet. To determine if the card is broken or damaged, you can test it in another computer system to see if it connects. If it connects in another system, then you know the card is not the problem. However, if it does not connect in any other system, then you know the card is faulty and needs to be replaced.
In some cases, the problem may not be related to the network card itself, but rather with the network settings on your computer. It is possible that your settings were changed during the installation or that there is a conflict between your old and new settings. Check your network settings and make sure they are configured correctly.
Finally, you may be having a connection issue with your Internet service provider. It is possible that the ISP has blocked your connection due to security measures or that your IP address has been blacklisted. Contact your ISP to troubleshoot the issue and confirm that your connection is working properly.
These are the most common reasons why you may not be able to access the internet after installing a new network card. If none of these solutions resolve the issue, you may need to contact a professional to help diagnose and fix the problem.