Hibernation in XP is very helpful in saving electric power. When you want to rest, eat or do something and leave you computer on, it will consume power while hibernation will turn your computer off and the best thing about hibernation is that when you turn on your computer again, your programs that you left like word, excel and others were still there..
Click turn off>press shift and the standby in the menu will turn to hibernate and then click it..
If that procedure wont work,
Go to Control Panel>Power options>Hibernate tab>and check the box of enabling the hibernation.
That’s all folks!
Assalamu Alykum!