I'm new to Slingbox. I set it up okay, and tested out Slingplayer on my iPhone and Kindle Fire, and it worked, but most of the time now, it just won't play, and I get a message that the power on the selected receiver is not on. I don't know what this means. The TV at home does not have to be on for you to play TV on your Slingplayer does it? Thank you.