I have a sony lap top PCG-5B16. Service
This is my fovorite thing about linksys routers, they hate everything. Unfortunately I still haven't figured out a technical way to fix this problem, but usually pressing the reset button on the modem and the router then unplugging them for 3 minutes and plugging them back in works. If thta doesn't work try going into the status page of the router and tell us what that says.