Dell Alienware Area 51 (Late 2009) - Manual (Page 10)

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CHAPTER 1: SETTING UP YOUR DESKTOP
Press the Power Button
Press the power button on the top of the computer.
Connect the Power Cable
WARNING: The power connectors and power strips vary among
countries. Using an incompatible cable or improperly connecting the
cable to a power strip or electrical outlet may cause fire or equipment
damage.