Sony PCG-GRX560 Manual

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To change the display when connecting an external computer display or projector 
When you connect an external display to the 
VGA (Monitor) port, you can toggle the output between the Liquid Crystal
Display (LCD), the external monitor, or both devices. 
Use the Fn+F7 key combination to select the display you want. See 
To 
Press  Result 
Switch to an external display  Fn+F7  Toggles between the LCD, the external display connected to the Monitor port, or both
the LCD and external display. 
  
 Connect the external display to the notebook or port replicator before you turn on the unit, otherwise the Fn+F7 key
combination will not work. 
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