Every one is so great on this site I hope you can help. Here goes:I have 4 computers on my wireless home network. Two laptops (Windows 7 & Mac OS 10) with internal wireless cards and two PCs (Windows XP) with Linksys wireless adapters. I use an Apple Airport Extreme (Model A1254) wireless access point.Three weeks ago, when Comcast Cable transitioned to all digital (I have my internet through them as well), I immediately lost internet access and wireless communication on all computers, printers and VOIP Phones.Because I was receiving a 169.xxx.x.x IP address on my main computer, I was instructed to and replaced my modem with a 1000BaseT model , replaced all ethernet cables with Cat6, and replaced the network card on my main PC with a D-Link 10/100/1000 mbps. Still no internet.The guys at Apple could not figure our why I could not connect so one changed my DNS server to a public one and all computers, except my main computer, immediately connected. They are now configured to obtain automatically and they are still connecting.When the Apple guys connected my ethernet cable from my main computer to the Airport Extreme, it would not connect and I received a 169 IP address and no DNS server address. When they connected my ethernet from my Airport to the other working laptops, they connected without problems and receive a valid IP addresses.They felt that some how the Comcast transition might have changed something with my networking/internet settings on my PC using Windows XP SP3 since my settings had been basically the same for 2 years. I have McAfee and Windows Firewall that I disable when I am trying to connect,When I look under connectivity in Systems Information, I have 0.0.0.0 for my IP address, subnet mask and dns serversDoes anyone have any suggestions? Thanks in advance.2 people got this answerI do too

Thanks everyone for replying. I am pleased to say that my internet now works. After many hours of calling Comcast Cable, they finally sent someone out that was not trying to "pass the buck." There was nothing wrong with any of my equipment. A squirrel had climbed up and chewed part of the cable. As long as there was not much speed going through it, the line was good enough to carry the feed. But with the upgrade, the damaged cable could not handle it. I have not had any problems since the cable was replaced.Thanks All