Advise please, i have got the receiver with 5.1 speaker system connected to the samsung tv with hdmi no problem all fine, so i have an amazon fire tv box and would like to have that connected to the receiver for surround sound especially for films but there is no sound when i select external speakers from the tv menu i get sound ok when watching sky with external speakers may be i have it connected wrong ? set up = the receiver and the fire box is connected to the tv with hdmi i also have the fire tv box connected to the receiver with one cable that has hdmi one end for receiver and other end usb to the fire box if i have the connections wrong can some one give me idiot proof instructions please.