If connect my laptop (HP CQ58)to the TV by the correct cable, put the TV on the correct input channel and insert a DVD into the laptop,initially the DVD shows on the laptop but then the TV connects and the picture appears on the TV. At the same time however, the picture goes from my laptop. It seems I cannot get the picture on both the laptop and the TV.If I want to see the picture on the laptop then I have to disconnect the TV How can have the picture showing on my laptop and TV at the same time?