i am a music teacher who is struggling to work out how to connect my ipad to the interactive whiteboard (smartboard) so that we can both view the picture and hear the sound. i have a VGA connection. i am able to have only sound or picture, not both. i have tried using a cord with a jack on each end, connecting to the ipad and the wall plate, with no luck. what connection should i be using? (very frustrating!!)