Lets try out few things here.
First please try a power cycle: Remove the power cable from the Linksys router, then remove the power cable from the modem, wait about 60 seconds, then plug in the modem, then plug in the Linksys router. Wait about 3 minutes while the modem and router sync back up. Once all light are back on, try to connect. Try to goto http://192.168.1.1 and see what happens.
If the above steps do not work you should try performing a factory reset by holding the reset button in back of the linksys router for 30 seconds, then wait 2-3 minutes for the router to sync back up. Try to goto http://192.168.1.1 and see what happens.
Let me know how it goes.