Sony PCG-FXA49 - Manual (Page 51)

Connecting an External Display
51
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.
Select one display at a time to playback DVDs.
✍
Connect the cable before you turn on the notebook, otherwise Fn + F7 will not work.
Only LCD LCD and external display
Only external display