I have a gateway keyboard and a what appears to be an LG computer. I wired in a TP- LINK wireless router and set it up. I bought a google chromecast for my flat screen TV to send shows I am watching on my computer to my flat screen. The chromecast setup on the TV ok. I followed the instructions to download the chromecast app for my computer. It downloaded ok, but I keep getting a message that wifi is turned off. My router is on and wired properly, and is functioning per manual. I do not have an Fn key on my keyboard and want to enable my wifi.