How to change the power buttons function in Vista

The default operation of the power button in Windows Vista is to send the computer into a new sleep mode that means the pc is not completely shut down, in order to actually shut down you have to click on the arrow near the shutdown button and select Shut Down.
To make sure that your pc always shuts down when you click on the power button you will have to go to the power options settings box which can be found through the control panel, then hadrware and sound, then power options.
Select advanced power settings.
Now expand power buttons and lid.
Now expand power button action.
Now select the action, in this case to Shut Down.
You can also change the action of the power button through the task pane on the left of the control panel. When you see the power options section, look to the left and you will find: Change what the power button does - you can select the option very easily through this method.