Have a MacBookPro at our church circa 2010 and running Mt. Lion (I think). We put in DVD which launches iDVD. We see video on computer screen but is not going out to projector; audio is perfect. Note that if I launch powerpoint on same computer, we get the video out to projector and screen perfectly so the connection is there. What would I need to change in order to get video of dvd out to projector. We have done it previously but has been about a year.