Sony VGN-FE500 Series User Manual page 168

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Troubleshooting
What should I do if the external display (or TV) does not display anything?
If you change the log-on user with the Fast User Switching function after the computer started, you will not be able to select
a display by pressing the Fn+F7 keys.
What should I do if the Fn+F7 keys do not switch the computer screen to the external
display connected to the monitor (VGA) port on the computer?
When the computer is attached to the optional multi function bay docking station, the monitor (VGA) port on the computer is
disabled. Thus, pressing the Fn+F7 keys toggles between the LCD and the external display connected to the monitor (VGA)
port on the docking station.