I've been experiencing this problem for the last few months off and on, and it's driving me insane. I have a Linksys WRT54G v4, and I'm absolutely unable to connect to it. All the connections to the router are fine, and connections from router to cable modem are fine as well. Connecting directly to the cable modem also works just fine. As soon as the router enters the equation, nada. My computer is unable to connect to the router, and ends up with the self-referencing 169.254.*.* IP address. In the past, I've tried re-flashing the firmware, but that has proven ineffective as the problem just comes back over time. The one clue that something is wrong is that the light for port 1 on the front is perpetually lit, whether a device is connected to that port or not. That port light just stays on, and I noticed this started happening when the problem first occurred. Any guesses as to what the problem might be? I am stumped and utterly frustrated as I thought Linksys was a quality brand. It's all the more frustrating since this is my 5th router in the last 6-7 years (I've tried them all... DLink, Belkin, Linksys, Netgear...)! Please help me!