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In my Windows XP desktop computer I select "Hibernate" option and computer closes itself. Then I don't use computer (for example I go out, or spend time in other rooms etc.) for hours. When I go back to computer I see that computer is started from Hibernated state.

But I didn't press Power button. What would be the cause that opens computer and how can I prevent it?

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Do you have Wake-On-Lan enabled in the BIOS, and is a network cable connected to the computer? Could be that it thinks it has received a wake-up signal via the NIC. –  Lennart Apr 18 '13 at 11:09
    
Sometimes it could be the mouse which moves and wakes it up. Do you use a wireless mouse? Try switching it off before entering hibernate mode? –  Alvin Wong Apr 18 '13 at 11:16
    
Sometimes the Antivirus which tries to make an update wakes the computer from hibernation. Is it at a specific time only or random times? –  syss Apr 29 '13 at 8:18

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