Network card does not connect to my router

[sagech]

I own a Belkin Wireless G Modem/Router. I connect my computer to it via Realtek RTL8139/810x wired network adapter.

Just a moment ago, my computer could not connect to the internet. When I ran the troubleshooting tool, it suggested to "Make sure the other end of the cable is plugged into the router. If that does not help, try a new cable."

I checked the LED light on the network card, and it appears to be solid red. I'm not too sure about its usual colour when it was working fine. The modem's LED shows that it detected a connection from the cable. I tried to replace the cable with another one, but it the light is still red and the modem still shows that it detects a connection from the cable, but my windows is not able to connect to the modem. It failed to detect any connection.

I am currently using a D-link wireless USB adapter to connect to the modem.

Can anyone tell me what is wrong? Is there a problem with my settings or is the network card damaged?

 

[kegobeer]

Have you checked the device manager to see if the onboard NIC is having problems?

 

[sagech]

Yeah, device manager is reporting that the NIC is working fine.