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I like using hibernation on my Win 7 SP1 x64. But there's a problem: hibernation itself works fine, but after shutdown the computer powers back up in a couple of seconds, so I must wait for it and shut it down again during POST.
I don't even know how to start debugging it. Is it some hardware fault? A BIOS setting that's causing it? Any ideas?

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I have this exact same problem, but it's very intermittent. Do you find that it always happens? i.e. if you clean boot the system and hibernate does it happen then? I sort of feel like this is a software issue but I also have not been able to track the source of the issue down. But then for me it only happens once every month or so. –  zelanix Feb 5 at 10:42
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Also, have you checked the windows Event Log? –  zelanix Feb 5 at 10:42
    
@zelanix: I didn't check the event log, what's the point? The problem clearly happens after Windows shuts down entirely. It's very persistent for me so far, tried like 20 times during 2 weeks and it happens every time. –  Violet Giraffe Feb 5 at 11:02
    
Because you are assuming that you system is off when it is in hibernate. Actually software can schedule the machine to wake even from hibernation (see here for an example application that does just that). –  zelanix Feb 5 at 11:07
    
@zelanix: fair enough, but shouldn't I be able to disable wake-up timers in BIOS setup? Also, I wouldn't know what to look for in the event log. –  Violet Giraffe Feb 5 at 11:09

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There are plenty of things that can cause this. Take a look at this troubleshooting guide.

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I've tried the steps from the guide 1 by 1, and finally have fixed the issue. What helped me was powercfg -devicequery wake_armed command. I've disabled "Allow this device to wake the computer" option for a couple devices, and turned out keyboard was causing this. I think it's some kind of BIOS bug or a motherboard hardware fault, because I wasn't touching the keyboard. –  Violet Giraffe Feb 6 at 7:17

There's something called wake-on-lan. Check your BIOS for that and disable it. Also check the setting where it takes action after a power restore. That can trigger the computer to come on by itself. This would be especially prone if your incoming power is a little bit buggy.

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