Sony PCG-FXA36 Primary User Manual page 52

Change text in this variable definition to document title.
Use the keys to select a display. See also "Selecting the Display Mode" for
Fn+F7
more information.
To Press
Switch to an Fn+F7
external display
Connect the cable before you turn on the notebook, otherwise Fn + F7 will not work.
52
Result
Toggles between the LCD, the external display
connected to the Monitor port, or both the LCD
and external display.
Only LCD
LCD and external display
Only external display