I used to use xbox live through internet sharing, using my Toshiba p30 laptop with a wireless connection. But since we got a new router because the old one went bust, every time i connect the Ethernet cord to my laptop and xbox, the internet goes down. it still says it is connected and no alerts pop up. it just wont work. it wont sign me onto xbox live and i cant even open a webpage unless i take out the ethernet cord, what could be causing this, and how can i fix it? thanks!