Windows 8 and 8.1 Forums

Question about sleep mode

  1. #1


    Posts : 18
    Windows 8.1 Pro x64

    Question about sleep mode


    Hey guys,

    I've recently started using sleep mode for my PC, no point leaving it on for many hours so I'd rather have it sleep.

    From what I understand, Sleep puts the PC in a low state power mode with settings and document saved in the memory.

    In my case, when I put my PC to sleep, everything shuts down. There is no "Shut Down" screen, but there are no case fans, no CPU cooling (Corsair H100i) working, no Mobo LEDs, no HDDs working, basically, the PC looks like it's completely shut down.

    However, clicking the power button and Windows appears on the screen within 2 seconds.

    So my question is, is the CPU running while in Sleep mode? I'm concerned about heat... If it is and the cooler is not running, isn't it dangerous?

    I have tried both regular sleep and hybrid sleep and in both cases the PC acts the same, it looks like it's completely turned off, but pressing the power button wakes it up in a sec.

    More info on this would be great, thanks

      My System SpecsSystem Spec

  2. #2


    In sleep mode everything is powered down except RAM and a few essential devices. The CPU is in a low power state and is not running. There is no need for the fans to be running. Be aware that if power is lost in this mode it is much like pulling the plug while the computer is running.

    Hybrid sleep is much the same except that RAM contents is saved to hiberfil.sys before entering the low power state. There will be no adverse effects from power loss. In that case the system state will be recovered from the hiberfil.sys file. It is a hybrid sleep and hibernation mode.
      My System SpecsSystem Spec

  3. #3


    Posts : 18
    Windows 8.1 Pro x64


    Thanks for the explanation
      My System SpecsSystem Spec

  4. #4


    The explanation given is correct, but going all the way back to the beginning, Sleep and Hibernate do not always work as advertised.

    To say that both are "Buggy" is an understatement. I can't even tell you, how many times I've read on some Help Forum where a guy says his PC went to sleep and never woke up again. So with that thought in mind, I always disable all SLEEP and Hibernate modes on every computer I set up.

    Your computer will be safer and your life simpler if you operate your PC in just two modes.....ON and OFF!
    Just like any other appliance.

    During Sleep or Hibernation, your power supply is still ON, producing DC power to the motherboard.
    If there is a power surge during that time, the motherboard will take the full brunt of it. Not Good!

    So what I've been doing for 30+ years, and encouraging all my customers to do, is do a full shutdown of the PC when you're done using it, and then remove all line power from it, like with a switchable power strip, or UPS.
    (UPS's will continue to charge their batteries, even when the output is switched OFF.)

    There are also, little known, things that Windows needs to do, but can only do during a hard shutdown.

    To make the Shutdown process simpler (just one mouse click) I create a Quick Shutdown shortcut on the desktop for all my customers.
    That desktop shortcut looks like this:
    %windir%\System32\shutdown.exe /s /t 0

    Just copy and paste that line into a New Desktop Shortcut and you'll have the quickest and simplest way to safely shut down your PC.

    Happy Computing!
    TechnoMage
      My System SpecsSystem Spec

  5. #5


    Posts : 18
    Windows 8.1 Pro x64


    Some useful info there... I always used my PC in on and off method but I like the fact that it wakes up and I can resume working ASAP.

    I have a very good PSU - Seasonic X 650, I've heard that it has a special protection for power outage situations which disconnects the power from all hardware when a spike occurs and this can protect it from getting damaged.

    Is that true?
      My System SpecsSystem Spec

  6. #6


    Not really!

    It's spec's as described by the manufacturer are somewhat impressive for a 'consumer product'.
    Remember, it's made to be sold to consumers, as cheaply as possible. It would never stand up to Industrial, military or NASA quality demands. Typically, consumer products are made with 'Hobby Grade' components, just like our motherboards, vid cards, etc.
    Witness, all the motherboards and PSU's with bulging capacitors. Eh?

    As someone who used to design and build SAFE power supplies, for a living, I do have some experience in the matter.

    NO, the only safe mode for any device that's not being actively used, is OFF, with all power removed.

    Also, power surges can enter your computer through a phone line or any peripheral device, thus destroying the computer.
    In fact, that's the most common path of destruction. I've seen severe surges come through a phone line, and blow the tops off of IC chips on the phone modem and then go into the motherboard and do the same kind of damage there. It can get really messy!

    But of course, YOU are the only one who can prevent damage to your PC.

    Good Luck!
    TechnoMage
      My System SpecsSystem Spec

  7. #7


    Florida, USA
    Posts : 141
    Windows 8.1 Pro x64 with Media Center, Windows 10 Pro x64, Windows 7 x64 Ultimate SP1


    Quote Originally Posted by TechnoMage View Post
    During Sleep or Hibernation, your power supply is still ON, producing DC power to the motherboard.
    If there is a power surge during that time, the motherboard will take the full brunt of it. Not Good!


    TechnoMage
    There is no power being used for hibernation. I think you inadvertantly included this.
      My System SpecsSystem Spec

  8. #8


    You are 100% WRONG. If the computer is connected to the Main, there is 5v being made in the PSU, otherwise even the Power ON button would not work. It's not really a switch, it's only a momentary contact push-button, like a door bell button.

    I've been building computers since 1980, I do know how they work.

      My System SpecsSystem Spec

  9. #9


    Florida, USA
    Posts : 141
    Windows 8.1 Pro x64 with Media Center, Windows 10 Pro x64, Windows 7 x64 Ultimate SP1


    Sorry but you can completely disconnect the power from the computer (for as long as you would like) and when reconnected it will resume from hibernate.

    No power required to keep hibernate alive since all data is written to the hard drive.
      My System SpecsSystem Spec

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