Sony PCG-GR300 Manual

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To select a display 
When you connect an external display to the Monitor port, you can toggle the output between the Liquid Crystal Display
(LCD), the external monitor, or both devices. 
Use the Fn+F7 keys to select a display. See also 
 for more information. 
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. 
  Note: 
 
Connect the cable before you turn on the notebook, otherwise Fn + F7 will not work. 
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