Sony VGN-BX740 User Guide (Microsoft® Windows® XP) User Manual page 192

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Troubleshooting
What should I do if the Fn+F7 keys do not switch the display output to the external display
connected to the monitor (VGA) port on my computer?
When your computer is attached to the optional multi function bay docking station, the monitor (VGA) port on your computer
is disabled. Thus, pressing the Fn+F7 keys toggles between the computer screen and the external display connected to the
monitor (VGA) port on the docking station.
What should I do if the external display stays blank?
If you cannot change the display output with the Fn+F7 keys, you need to change the settings for the external display with
VAIO Central. To change the settings, launch the VAIO Central, select the control item for the external display, and then
click to select the check box for changing the options to detect the external display. Then, try the Fn+F7 keys to change the
display output.