I have a puzzling problem with my networking setup. I have router1 connected to my cable modem and a long ethernet cable that goes to my office (in another building) and connects to router2's WAN port to provide internet to the office. The internet stopped working in my office recently. At first, I thought router2 was bad so I replaced it. New router doesn't even recognize the cable as being connected. If I do the same set up with a different ethernet cable, I get a connection. Also, the cable is not recognized if I plug directly into my desktop - at the office. I even tried switching routers and got the same results. So, it would seem that my long ethernet cable to the office is bad. However, I can take the same cable and connect it to my laptop and get a perfect connection. What could be wrong with an ethernet cable that causes it to work in one computer but not another one?