Sony VAIO VGN-N300 - Manual (Page 18)

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Getting Started
Connecting a Power Source
You can use either an AC adapter or a rechargeable battery pack as a power source for your computer.
Using the AC Adapter
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Use your computer only with the supplied AC adapter.
The supplied AC adapter has an attachment on its plug to avoid accidental disconnection.
To use the AC adapter
1 Plug one end of the power cord (1) into the AC adapter (3).
2 Plug the other end of the power cord into an AC outlet (2).
3 Plug the cable attached to the AC adapter (3) into the DC IN port (4) on the computer, while fitting the extension of the
plug attachment on the bottom of the computer as illustrated below.