I havve a DPP twin or Leagcy Quad LNB.. I think that is the same thing
I posted an image in the other thread that you posted this same question.
How to properly align your satellite dish - Discussion and Tips
Have a look at posts 560 onwards where I replied to you.
They are NOT the same thing at all. Neither require a separate Power Inserter to work. From what we talked about on that thread it sounds like you have a defective LNBF or port on it.