By default, the power button in Vista's Start menu activates sleep mode rather than switching the computer off. Sleep mode conserves some power, but if the PC will be left unattended for some time it's always best to turn it off properly. To tell Windows that the button should turn the PC off, open the Control Panel, choose Classic View, open Power Options then click the 'Change plan settings' link beneath the currently selected power plan. Click 'Change advanced power settings' and expand the 'Power buttons and lid' entry. Expand the 'Start menu power button' entry, click the menu next to Setting and select Shut down before clicking OK.

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