I do run active directory on my server. It says a blinking light is a collision, what exactly does this mean? I know what a collision is, but not in networking terms. I need to send and recieve email, as well as host web applications. I will not be using Exchange to send email because Verizon blocks port 25, instead I have purchased mail relays from a company called No-IP. Do I need to run a DNS server if I already have them through my Domain Registrar? I will try a new router, but I am more than sure it is the server because up until the day I added it every computer on the network was working fine. Thanks for all of your help!