Change the function of the Power button in the Start menu in Vista

• Open Power options (Control Panel-Power options).
  
• Under the currently selected power plan, click Change plan settings.
  
• In the Edit Plan Settings dialog box, click Change advanced power settings.
  
• In the Power Options dialog box, click the plus sign (+) next to Power buttons and lid to expand the list.
  
• Click the plus sign (+) next to Start menu power button to expand the list.
  
• On a desktop computer, in the Setting list, click a setting for the Power button.
  – or –
  On a mobile PC, in the On battery and Plugged in lists, click settings for the Power button.
  
• Click OK.