I just purchased a RVS4000 to replace a dead BEFSX41. Firmware is 1.00.15 which I installed as soon as I opened the box. When I connect only my desktop to the router, I can access the internet. If I plug in any other device (network printer, laptop, or a WAP) nothing works. My desktop can't even access the router's UI. If I only plug in my laptop it works. If I then plug in my desktop, nothing works. I did an ipconfig on each PC. Each PC is getting a unique IP address. The router is using all the default values. The only thing I changed was the userid/password, the firmware upgrade, and an IPS signature update. I've tried disabling IPS, and disabling my Norton IS 2006. I've enabled and disabled MAC cloning. I'm set to have the router be a DHCP server. The router and cable modem has each been powered off and reset (in the case of the router) multiple times. I think I've tried all the easy stuff. Does anyone have an idea on what's wrong?