I have a Thomson DCM475 cable modem. I have it connected Cat6 to my main PC. Works perfect. Remove that cable from the back of that Win8(64) PC and plug it into any of my other 2 Win 8(64) laptops or with a new cat6 attach to my Storage PC or My HTPC and I have nothing. IPconfig would not ping a server on anything except the my main PC. I am frustrated as I have tried so many different scenarios and the only one that works is my main PC. Can the port be bad on the modem, although it is new? I have also tried connecting 2 different routers to the modem and neither one can get an IP from the modem.