The power inserter is a small metallic colored square box with a supply unit that is a black plastic rectangle shaped box, usually installed behind a receiver. It has a small light in the corner of it that should be lit. To aid in finding it, try unhooking whatever line is connected to Receiver Port 2 on the switch and see which receiver goes down. Then check behind the other receiver, following the coax from the wall to the box. You may have to trace the line all the way out, but one of them should have it. If not, you really ought to call DISH and tell them you don't have a power supply on your DPP44 switch, that it is only receiver powered.