There are a number of reasons why your network card may not be connecting to the internet. Please try each of the following steps in order to attempt to resolve the issue.
1. Check device drivers: The most likely reason for a failure to connect to the internet is that your device drivers are out of date or otherwise malfunctioning. To check the drivers on your network card, open Device Manager by right-clicking on the Start menu and selecting it from the list of options. Navigate to Network adapters and double-click your network card. Under the Driver tab, press Update Driver and follow the instructions. If this does not resolve the issue, you can also try uninstalling the driver and then reinstalling it.
2. Check settings: Network cards have certain settings that must be configured correctly in order for them to function properly. To view and adjust these settings, open the Network and Sharing Center by clicking the Start menu and selecting it from the list of options. Select Change adapter settings, right-click your network card and select Properties. Locate the Internet Protocol Version 4 (TCP/IPv4) setting and click Properties. The General Tab should allow you to configure your IP address, DNS server and Default Gateway. Make sure these settings match those provided by your ISP or network administrator.
3. Check cables and ports: Poorly connected cables and blocked ports can cause connection issues with network cards. Check all of the cables connected to your network card and make sure they are securely connected at both ends. If you are using a router, make sure it is powered on and the cables are securely connected. For wireless connections, make sure the adapter is turned on and connected to your router. Also open your router’s settings page and make sure the correct ports are opened for the application you are trying to use.
4. Check other devices: If other devices on the same network are able to connect to the internet, the issue may be with your network card. Try disconnecting the network card from your computer and plugging it into another computer. If the other computer is able to connect to the internet, then the issue is likely with your computer’s configuration. If the other computer is unable to connect to the internet, then the issue is likely with your network card.
5. Check firewall settings: Firewall settings can block access to the internet, so make sure your firewall is not blocking your network card. Open the Windows Firewall by clicking the Start menu and selecting it from the list of options. Select Advanced settings and locate your network card under Inbound Rules or Outbound Rules. Make sure the status is set to Allow, and if necessary add an exception to unblock access.
6. Reset your hardware: If all else fails, you can try resetting your hardware. For wired connections, turn off your modem and router and unplug their power cables for 30 seconds. Then plug them back in and turn them on. For wireless connections, reset the wireless adapter by pressing the reset button on the back of it. Then reconnect the adapter to your router and try connecting again.
If none of these steps resolve the issue, then it may be necessary to contact your ISP or network administrator for further assistance.