I'm running Windows 7 Ultimate on a Toshiba laptop A10. The screen goes blank when it projects on a screen if I connect the projector to the laptop prior to starting the laptop. All touch pad and mouse movements show up on the screen. If I make the connection after the laptop starts it does not show up on the screen and doing Function and F5 does nothing. I've lowered screen resolution but to no avail. Could my graphic card be the culprit or should I learn to live with it unless there is a solution. My thanks for comments in advance.