Each time I change the input it says No Signal. I have all the cords plugged and the Wii turned on, but it still won't work. Can someone please help me?

Hi,

I had the same issue. I bought a new cable to connect it to the TV.
In my case it worked after I changed the cable.

Is it possible that your roku reset itself ? If it has done that then you will need to re-enter your information for your WiFi. There should be a name and network password to acess it. Go to the settings portion of your menu and choose connection.