To hibernate your PC, first you have to enable hibernation. Right-click on your desktop and click on properties to get to display properties. Click on Screen Saver and then on Power near the bottom of the box. Go to the Hibernate tab and then click 'Enable Hibernation'. Then click 'Start', 'Turn off computer', then hold down shift and the Stand By button should become Hibernate. Click on that and then your computer will go into hibernation. To start it up again, just push the power button on your computer.