Sony VGN-BX61MN User Manual page 187

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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 Control Center. To change the settings, launch the VAIO Control Center, 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.