I have cable internet with a cable modem connected to my computer through a USB cable. The cable modem is a motorola surfboard sb4100. I assume the ethernet cable is the only cable you can connect the xbox 360 up with. I connected the Xbox to the computer with the ethernet cable to the motherboard. The motherboard is a Biostar p4m800 When I try to test the connection on the Xbox 360, it fails at the ip address part. I have tried following all the suggestions provided but nothing has worked yet. Strangely, ethernet connections don't seem to work well with this computer. The cable modem is described as a "usb modem" but has an ethernet slot on the back of the modem. When I've tried to hook the ethernet cable up to the modem, it doesn't show any connection on the Xbox. Also, on the Xbox support website thing, because the Ethernet isn't plugged directly to the modem, but to the motherboard of the computer, I don't know which type of connection problem solving methods to try: Direct connection with a modem only • Shared connection with a modem and a router • Shared connection with a gateway device (combined modem and router) • Shared connection with Microsoft Windows Internet Connection Sharing (this is on http://support.xbox.com/support/en/... Biostar P4m800-m4 Pentium 4 Prescott @ 3GHz 1GB Corsair PC3200 RAM Geforce 6200 AGP 2 80Gb Harddrives XP Home SP2

I figured it out I had to edit these details located on the support site Enter manual settings in the Xbox 360 Dashboard for IP address, subnet mask, DNS address and gateway and test the connection:To edit the settings: a. In the Xbox 360 dashboard, move to the System section. b. Select Network Settings. c. Select Edit Settings. d. Enter the following: • IP Address : 192.168.0.2 • Subnet mask : 255.255.255.0 • Default Gateway : 192.168.0.1 • DNS server (Primary): 192.168.0.1 • DNS server (Secondary): 192.168.0.1 Biostar P4m800-m4 Pentium 4 Prescott @ 3GHz 1GB Corsair PC3200 RAM Geforce 6200 AGP 2 80Gb Harddrives XP Home SP2

I had the same problem, but wasn't smart enough to do what you did. I called my ISP and they were able to see the problem from thier end and were able to change the IP adress on their side.