When I mirror my iPad using Apple TV I lose a portion of the screen. I'm using a Dell S300WI projector with HDMI. Apple TV shows full size on the screen which is great, but when I mirror the iPad I lose a couple inches off the top and bottom (along with a large amount on the sides which is expected). The projector has a resolution of 1280x800, so I'm guessing the output when I mirror is at 720 lines so I lose about 10% of the vertical space. I have the same issue on an older LCD television in my classroom. When I mirror on my TV at home using Apple TV, I don't have this issue. The iPad mirroring uses the full height of the television. Anyone else having this issue, or know of a way to not have this happen? I called Dell to see if I could override the resolution on the projector. I tried to clarify with the person and asked if they really knew the issue I was having. They told me they did and then said the solution was to adjust the feet on the projector. I hung up at that point.