How is the MacBook connected to the router?
Wired or Wireless.
If Wireless, try removing the security on the wireless network and try again.
Try connecting with the MBP directly wired to the router.
Leave the settings as DHCP.
Let us know how you get on
I have snow leopard, the newest one, on my macbook pro 15 inch. It is brand new and works flawlessly, and I connect it to many different networks.
The only network it wont work on is my home connection. There is one other computer on the wireless at home and it works fine. My mac will connect to the linksys router, but not to the internet. When I look at airport it says it does not have an IP.
So I manually put in the router IP and all of that information, and now it reads as connected, and to the internet. However If I go to any websites, it will try to load it, and then time out. I have full reception.
Here's the kick - If I connect it directly to the router via ethernet, it says "cannot find IP", which I've never seen in my life.