Sony VGN-FE780G - Manual (Page 217)

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Troubleshooting
Multi Function Bay Docking Station
What should I do if I cannot use the devices connected to the multi function bay docking
station?
Make sure to use the AC adapter supplied with the multi function bay docking station to connect the docking station to a power
source. The multi function bay docking station does not work on the battery pack installed in your computer.