connecting to the internet

I posted the following message earlier: I have two computers, a dell dimension 4100 and a dell dimension 4700. The 4700 will not connect to the internet. I have direc pc with a 7000 modem. I have a belkin wireless router. Both computers are plugged into the router. The 4100 will connect to the internet but the 4700 will not. I spent hours with the direcpc people, and set up the 4700 manually with the ip address, the gateway and the subnet mask. They told me that I probably had a bad ethernet card. I purchased a linksys etherfast card, and installed it. Still no copnnection. When I use the linksys, I get a connected message, but no connection, and 0 packets sent or received. When I use the onboard ethernet card, I get a limited or no connection message. Since the 4100 will connect, I know that the modem and the router are working. I have tried direct connections with the 4700, and I have tried changing the cables to the port that works with the 4100. I know no other way to try and get connected. Does anyone have any other suggestions? I forgot one important fact. I was connected to the internet with the 4700, but the connection from the satellite to the modem came loose. After I had a new connection put on the cable, I could not connect to the internet. This was the reason for the new ethernet card. I am still stuck. thanks ranjo24