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My PC is homebuilt and the specs are in my sig. Whenever I try to put it to sleep for the night, it powers back on for some reason. Anyone care to weigh in as to why this would happen? I am running Windows 8.1.

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Posted

There's a wake timer somewhere. Try checking your network adapter properties for them and turn them off.

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Posted

Go into your power profile, check under the sleep options, and set "Allow wake timer" to disabled.

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Posted

I had this happen to me, windows was waking up from hibernation all the time. turned out it was media center waking it up to update it's self :argh:

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Posted

Check that it is not a part of a Home Group. Being a member caused the same problem. My computer would wake up but not go back to sleep.

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Posted

I haven't yet gone down the Windows 8 train so I'm not sure if MS removed this feature...

 

Open CMD as administrator and run "powercfg -lastwake" (without the quotes) and it should tell you the last device that caused the computer to wake from sleep.

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Posted

Is you motherboard by any chance by ASRock? If it is then you have enabled something called "Dehumidifier". It's a motherboard feature that powers the computer automatically up after you've already put it in S4/S5 sleep state, in order to dehumidify the system.

 

https://www.youtube.com/watch?v=-mQfFVT4tT8

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Posted

i have this same issue ever since i installed windows 8 (and 8.1) on both my desktop and laptop. i read a KB article from MS that supposedly fixed the issue in a recent patch, but it wasnt fixed.

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Posted

powercfg /lastwake every time.  Nails the culprit for waking it up and saved me a lot of rummaging about.

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Posted

and powercfg /waketimers to see the wake timers set for your system :)

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Posted

Some bios's have the awake/timer "feature" in them also.

 

I'd go with what Dot Matrix said though :)

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