I have a new PC (Dell XPS 8300) that I am trying to connect to my 6 year old cable modem, but it won't connect. The modem is a Motorola SB5100. I have tried several times using the online instructions from Comcast and Motorola, without success. Right now I am using the old PC and the old modem with no problem. Any suggestions?
Direct connection between modem and PC. Did not power cycle modem because it continues to work fine with old PC - I am on that connection now. Old PC has Windows XP and new has Windows 7. Comcast instructions say to set properties for TCP/IP version 4 on networking tab but old modem may not work with V4?