I recently built a PC that is using a Gigabyte motherboard and Windows Vista Home Premium OS. I am directly connected to a modem, but the computer is only detecting a wireless signal, so I'm able to connect wirelessly but not locally. The cable light on the modem is receiving activity, so I'm not sure what's causing the problem. What is most likely the issue here? I'm really hoping that the ethernet card isn't bad, but if it is, what are my options other than replacing the motherboard?