I am trying to build a home network. I have a wired router and two computers. The router will live upstairs next to one computer; I have run the wire from the second floor down to the unfinished basement and over to the area on the first first floor where the second computer is located. I am using quality blue network cable. I have used a RJ45 crimper to install ends on either end of the network cable. I cannot get the router to recognize the computer on the first floor. The computer on the second floor is fine. I unhooked the CPU on the first floor and connected it to the router using a short 6' cable that I created from the remnant's of the same cable. Then, the router recognizes that computer. I have triple checked to ensure the wires are in the correct order. I have check and there are no tears or kinks in the wiring running through the house. Anybody have any idea what else I might look for? The total length of the wire is less than 80'. I have built networks at 150' with no problems in the past. Thanks, Chris

Take the working computer to test on the cable downstairs. If it works then there has to be something wrong with the cable or connections