So I've had a problem with my internet connection since a logic board replacement last week. It recognizes the network, but won't connect to the internet. When checking network diagnostics it says Self-Assigned IP or something to that effect. So on the home network I powered down the router and cable modem and this worked. The problem is now with a network at school. This network requires a webpage sign in for access, like wireless found in airports, etc. When I open either safari or firefox I simply get the screen that shows not connected to the internet, not the re-direct to the sign in. Anyone have any suggestions? Copied from the Mac Basics board, I apologize if that's not what to do.