The DPP 500+ does not require a power supply, on your check switch screen you should see DB+ as your lnb type for 119/110/118.
If it say something else, then disconnect cable from receiver and run check switch to clear matrix, after it's finished save it, this test will take aprox 20 minutes.
the reconnect the sat coax to the receiver. As for aim and signal on the dish you should use port #2 on the lnb and aim for 110 sat.