I am running NT4 with SP6a. I had a Intel 10/100 NIC and switched over to a Fiber Optics PCNet based NIC. The problem I am having is that the link light is on as the computer is booting up then dies when it reaches the press clt-alt-del screen. I switched NICs, Cables, Ports on the wall and the hub. I removed all the network settings and tried reinstalling them...but now I get an error message with the TCP/IP protocol. It tells me that some service is running already and something about the workstation name is already identified. I am stumped...anybody got any suggestions I can try? besides format and reinstall...I wanna use that as a last resort. By the way it was working fine with the INTEL NIC...