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  1.    10 Apr 2017 #1
    Join Date : Jul 2015
    Posts : 132
    Windows 8.1 Pro

    Remover Power Supply during Hibernation or Hybrid Sleep?


    Hello all,

    I have 3 questions regarding putting a PC into a lower energystate.

    1. Can the PC be damaged if I turn off and remove the Power Supply and opening the case to clean the PC, while the PC is in Hibernation Mode instead of having it fully shut down?

    2. I've seen in the energy options that there is a Hybrid Sleep state as well. How can I determine if my PC is in Hibernation or in Hybrid Sleep mode? I usually select the option in the start menu Power icon, but since the language is in Dutch, I'm not sure which is which. I can press a key on the keyboard to turn the PC back on if that info is of any use.

    3. If my PC is in Hybrid Sleep mode, will it do any damage to the PC if I remove the power supply, open the case and clean the PC?
      My ComputerSystem Spec
  2.    10 Apr 2017 #2
    Join Date : Jul 2015
    Posts : 3,758
    10 Pro

    Either will be OK as both hybrid sleep and hibernation write contents of RAM to disk. Hybrid sleep keeps contents in RAM as well - that is the difference.

    These pictures might help: Comparing Sleep, Hibernation, and Hybrid Sleep on Windows - TekRevue

    I'd unplug it from the wall before opening the case anyway though.
      My ComputerSystem Spec
  3.    10 Apr 2017 #3
    Join Date : Jul 2015
    Posts : 132
    Windows 8.1 Pro
    Thread Starter

    Quote Originally Posted by lx07 View Post
    Either will be OK as both hybrid sleep and hibernation write contents of RAM to disk. Hybrid sleep keeps contents in RAM as well - that is the difference.

    These pictures might help: Comparing Sleep, Hibernation, and Hybrid Sleep on Windows - TekRevue

    I'd unplug it from the wall before opening the case anyway though.
    Thanks for the reply. I've indeed found that article before. But, if Hybrid Sleep still uses RAM while RAM needs power, how can it be ok to turn off the power supply during that mode?
      My ComputerSystem Spec
  4.    10 Apr 2017 #4
    Join Date : Mar 2017
    Posts : 5,872
    64-bit Windows 10 Pro

    Quote Originally Posted by JohnnyGui View Post
    Thanks for the reply. I've indeed found that article before. But, if Hybrid Sleep still uses RAM while RAM needs power, how can it be ok to turn off the power supply during that mode?
    You can't. Once you remove the power supply anything in memory vanishes? Nothing will happen if you just turn your PC off and the clean it.
      My ComputerSystem Spec
  5.    10 Apr 2017 #5
    Join Date : Jul 2015
    Posts : 132
    Windows 8.1 Pro
    Thread Starter

    Quote Originally Posted by Josey Wales View Post
    You can't. Once you remove the power supply anything in memory vanishes? Nothing will happen if you just turn your PC off and the clean it.
    In that case, it shouldn't also be a problem if you remove the power supply during a normal sleep state?

    Wouldn't that be a risk to corrupt or damage the RAM memory?
      My ComputerSystem Spec
  6.    10 Apr 2017 #6
    Join Date : Aug 2016
    S/E England
    Posts : 4,543
    10 Home x64 (1709) (10 Pro on 2nd pc)

    Quote Originally Posted by JohnnyGui View Post
    ...if Hybrid Sleep still uses RAM while RAM needs power, how can it be ok to turn off the power supply during that mode?
    Because Hybrid Sleep has two copies of the RAM data - one in the RAM itself, the other written to disk. It uses the RAM if available, or restores the RAM from disk if not. The key line in the article is...
    When enabled, hybrid sleep writes active data to the hard drive (like hibernation), but also maintains low levels of power to RAM (like standard sleep). This allows a user to wake the computer quickly, but also protects user data with a copy on the hard drive in the event of a power failure.
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  7.    10 Apr 2017 #7
    Join Date : Jul 2015
    Posts : 132
    Windows 8.1 Pro
    Thread Starter

    Quote Originally Posted by Bree View Post
    Because Hybrid Sleep has two copies of the RAM data - one in the RAM itself, the other written to disk. It uses the RAM if available, or restores the RAM from disk if not.
    That clears it up. So if I understand correctly, it shouldn't be a risk of RAM damage if I remove the power supply while RAM is receiving power? The same thing happens if you completely shut down the pc?
      My ComputerSystem Spec
  8.    10 Apr 2017 #8
    Join Date : Jul 2015
    Posts : 3,758
    10 Pro

    Quote Originally Posted by JohnnyGui View Post
    That clears it up. So if I understand correctly, it shouldn't be a risk of RAM damage if I remove the power supply while RAM is receiving power? The same thing happens if you completely shut down the pc?
    That's right. When the power is lost the contents of the RAM are lost. It doesn't damage it.

    When you restart if it was in Hybrid Sleep it will see the RAM is empty and restore the contents from the disk.

    If it was in Sleep there would be nothing in RAM and nothing to restore from disk so it would do a cold boot which probably wouldn't damage anything (certainly not hardware). You would however lose what you were doing and could potentially corrupt Windows although it never happened to me.

    Do unplug it from the wall though - don't just open the case and remove the power supply with it still plugged in to the mains.
      My ComputerSystem Spec
  9.    10 Apr 2017 #9
    Join Date : Jul 2015
    Posts : 132
    Windows 8.1 Pro
    Thread Starter

    Quote Originally Posted by lx07 View Post
    That's right. When the power is lost the contents of the RAM are lost. It doesn't damage it.

    When you restart if it was in Hybrid Sleep it will see the RAM is empty and restore the contents from the disk.

    If it was in Sleep there would be nothing in RAM and nothing to restore from disk so it would do a cold boot which probably wouldn't damage anything (certainly not hardware). You would however lose what you were doing and could potentially corrupt Windows although it never happened to me.

    Do unplug it from the wall though - don't just open the case and remove the power supply with it still plugged in to the mains.
    Thanks for clearing this up lx07. I always unplug everything from the wall and discharge myself before cleaning it, thanks for the advice nonetheless.
      My ComputerSystem Spec
  10.    10 Apr 2017 #10
    Join Date : Mar 2017
    Posts : 5,872
    64-bit Windows 10 Pro

    Quote Originally Posted by JohnnyGui View Post
    In that case, it shouldn't also be a problem if you remove the power supply during a normal sleep state?

    Wouldn't that be a risk to corrupt or damage the RAM memory?
    No, you have never turned off your PC? you have never lost power? Anytime I mess with a power supply I remove AC to. I have worked on some huge power supplies and or inverters that backed up a DMS 100 Switch. Nothing will happen to your PC. what is stored is temporary files. I have cleaned my PC about once a month and I never had to remove the PS to do it
      My ComputerSystem Spec

 
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