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Question: Problem with dispalyed image through projector

i am trying to connect a projector 3M SPC716 to a Toshiba L650D when i connect it I can see the image no problem on the big screen but then it flicks back to the setup screen then back to the active screen on the laptop if. the image remains solid f i use only the projected screen and leave the laptop screen blank how can I get the image on both without the anoying ficking of the projected screen