if the above suggestion does not work, then try unplug the power from both the router and modem (if you have both) for a slow 10 count. plug in the modem and wait for it to turn on completely, once all the proper lights are on, plug in the router wait for it to completely come on. Sometimes, even though all your other devices are working, you got to give it a reason to do a (using echos terminology) discovery.
if that does not help either, how far is the echo from your modum/router? any new wireless devices lately?