I bought a mobo for a dell dimension 8100. This is the first time I cannot establish a net connection. The board came complete with cpu, heat sink, vrm, and video card. The board has on board nic. The nic is detected but not active. Same for any nic card I install. I reloaded the OS, XP PRO, tried the connection wizard, changed hard drives, and more. Nothing works. I even swapped lan ports and routers including direct to the modem. I am running out of ideas. Have any? Something in the bios screen? THis is a spare system in that I do not have a case for it. I laid it out on my table and it works 90%. My other spare is similar but the audio card is not detected. I use a usb powered headphone device to get around that. Any way of activating the nic, either one? It should be simple. The only other choice is to order an OPTIPLEX 400 board. I did that for THIS tower. 100% success immediately. Expensive. There must be a cheap way.