First of all, i will ask you to check the connection between router and modem. make sure both of them are connected with each other properly.
after checking the connection, you need to power off your router and modem for one minute.
now turn on the modem first, and wait for 10 seconds.
now turn on the router as well.
let’s see what color of light can you see on the router now.
according to me, you should not be having linksys router not working problem anymore.