Belkin Wireless G Gaming Router Problem

I just bought the gaming router for my Xbox 360 and when I hook it up I get an error saying it doesn't have an ip address. I checked my dhcp and everything looked fine. When I hooked the router to a computer it got a connection from the router with no problem for about three minutes, then said that it didn't have an ip address. I unplugged the router and after turning it back on it worked just fine on a pc. After plugging it back in to the 360, however, it encountered the same problem. Can anyone shed some light on this problem for me?