I have a 24R and after reading all the posts I too could not find the mysterious lighted power button. Finally found the button, but it was not lighted and almost impossible to see. In cabinet over the door there is a receptacle that the 12 volt adapter plugs into as well as the cable going to the TV. Behind the cable and out of sight is a button, push to power off for cable. Push again for air. Just remember to use your TV menu to add channels for cable after powering off with the button.
Larry and Mary
Solera R 2013