Log off or Hibernate computer is actually a good tool to save your power and also to give rest to your computer. To Log Off or Hibernate your computer you will need to follow these steps:
(You can press any button during Log Off or Hibernate time to turn on your computer again.)
Stand By / Hibernate:
Step I:
Click on "Start Menu" button in the left lower corner of your computer's window with the help of left click from your mouse. (A new window will open).Step II:
Click Log Off button in new window.(You can press any button during Log Off or Hibernate time to turn on your computer again.)