Windows 8 and 8.1 Forums


Fan at full speed during shut down and sleep

  1. #1


    Posts : 5
    Windows 8

    Fan at full speed during shut down and sleep


    Hello all,

    I recently purchased a new desktop and it came with Win8 installed on it. Everything worked fine for the first two weeks. Then, I noticed my fan was running at full speed when I'd come into the room after a while. My desktop was in sleep mode, so I was like, WTF...? Woke my desktop up and the fan returned to normal. Strange I thought, maybe it was just a one time thing. Nope... Every time my computer goes into sleep mode, the fan kicks on full blast. Okay... maybe no sleep mode, but the fan will shut off when I shut down my computer, right? Nope again. When my computer is shut down, the fan is still running at full speed. The thing is, when my computer is in sleep mode or shut down, the fan runs at full speed, but when I'm using it (like now) the fan is normal.

    I've been looking around trying to find something related to my problem. I've came across a few articles on the forums, like Fans still running after shutdown of windows 8. Seems like my same problem, but it was during his install he shut down Windows. However, there was talk of this "bcdedit /set disabledynamictick yes", but I don't really want to mess with the my boot.ini files... I'm not bad at small programs, but I really don't want to toy around and destroy my desktop right now.

    I've read some other articles about a Win8 laptop in idle mode with the same problem, and they said it was antivirus related. I figured that if that were the case, shouldn't have I seen it during the first time I booted up my desktop?

    Finally, I may be crazy here, but I think I started noticing this problem AFTER I installed some windows updates from Microsoft... I don't know if there is a way to verify that everything went smoothly, I kinda assumed and left my computer running while it was updating...

    So all that being said, can someone please point me in the right direction so I can get this problem fixed? It is just super annoying and I'm a bit salty that I have to baby sit my desktop so the fan doesn't sound like a jet taking off...

      My System SpecsSystem Spec

  2. #2


    Maryland USA
    Posts : 758
    Windows 8 & Windows 7 Dual Boot


    Many things can cause this such as system maintenance when idle, have you noticed the harddrive accessing constantly when the fan speed is high?

    Could be disk defrag, windows update installing, anti-virus scan when idle...

    If its a scheduled task, go to your start screen and start typing task, click on task scheduler and see whats been tasked.
    You can check from past 2 hours, 24hrs, days, etc.....
      My System SpecsSystem Spec

  3. #3


    Posts : 480
    Windows 8 Pro x64


    This is automatic maintenance in action, and this is normal. There's no need to fix it, but you can disallow it to wake up your pc.
    See
    • Tutorial Automatic Maintenance - Change Maintenance Settings in Windows 8
    • My answers in Windows 8 Automatic Maintainence Question
      My System SpecsSystem Spec

  4. #4


    Posts : 5
    Windows 8


    @Brooklyn,
    No, like my computer is completely shut down. There are no lights on, HDD is off, and the fan is still running at full speed. I can see the fan running while sleeping if the computer is running some background action like a disk defrag, but its not.

    @Vadikan,
    My Maintenance is scheduled for 3:00 AM. I notice this problem with the sleep/shut down fan running when I go to work and come back (8:30AM-6:30PM).

    I'm competent but not a wizz with computers, but I think the computer thinks its starting to overheat when in shut down/sleeping, so the fan goes to full speed to cool off the insides. I'm thinking about moving the fan on the motherboard to another port. Maybe that will help?

    Thanks for the replies,
    Matt
      My System SpecsSystem Spec

  5. #5


    india
    Posts : 101
    Windows 8 pro with WMC x86 & windows Blue preview x86 with Windows 7 Ultimate SP1


    decrease your clock(CPU processing rate) in the bios and tell us what happens...
      My System SpecsSystem Spec

  6. #6


    Sloe Deth, Californicatia
    Posts : 3,908
    Windows 8 Pro with Media Center/Windows 7


    If you got Cool N Quiet on it, you can turn it ON on the BIOS. You didn't mention what kind of system it is - If it's a Gategay? That's a common occurrence. Even with CNQ turned on. The reason why it's turning on full speed, is cos the system is running hot. Is it the system fan or the CPU fan that is running high?
      My System SpecsSystem Spec

  7. #7


    Posts : 480
    Windows 8 Pro x64


    Quote Originally Posted by dooky View Post
    @Vadikan,
    My Maintenance is scheduled for 3:00 AM. I notice this problem with the sleep/shut down fan running when I go to work and come back (8:30AM-6:30PM).

    I'm competent but not a wizz with computers, but I think the computer thinks its starting to overheat when in shut down/sleeping, so the fan goes to full speed to cool off the insides. I'm thinking about moving the fan on the motherboard to another port. Maybe that will help?
    Matt,

    Scheduled ≠ Executed at the scheduled time. If the latter is missed because you PC was off or you were working on it, automatic maintenance (AM) starts the next time your PC goes idle (see the link in my previous post).

    The goal is to complete all tasks under the AM umbrella ASAP, therefore they run under the high performance power plan and heavily utilize CPU resources. That's the reason your fan makes some noise to cool off the CPU. It's all perfectly normal.

    People are historically concerned about fan noise when they leave the PC unattended It was pretty much similar with the previous Microsoft OSs. The difference is that AM in Windows 8 consolidates all maintenance tasks (they have no triggers in the Task Scheduler) under one scheduled task that runs them concurrently at full throttle.

    Vadim
      My System SpecsSystem Spec

  8. #8


    Sloe Deth, Californicatia
    Posts : 3,908
    Windows 8 Pro with Media Center/Windows 7


    Yah, during Sleep, if you have scheduled a Disk Optimizing session, it will be mroe active. Also, when the system is running a screensaver I think you can set the Optimizer to run. I don't know where those settings are, but I've seen them, maybe in Advanced Power Options.
      My System SpecsSystem Spec

  9. #9


    Posts : 5
    Windows 8


    Decreasing clock speed only slowed me down, still getting the fan noise when shutdown.

    To be honest, I don't really know which fan it is. I think its the system fan and not the CPU fan... I'll find out later.

    I don't think my computer is overheating, but I have been wrong before... If it is true my computer is going haywire tring to finish the... automatic maintenance...? then i can see that. Is there a way I can set that to a specific time only and then shut down? Like during the night from 4-7 and then no more?

    Side note, why would my fan still run if my computer is shut down? I don't see any LED's blink to tell me the HDD is working and i'm getting no output.

    Matt
      My System SpecsSystem Spec

  10. #10


    Sloe Deth, Californicatia
    Posts : 3,908
    Windows 8 Pro with Media Center/Windows 7


    No, it should be totally shut off, so the system may be in sleep mode. Hit the space key, or shake the mouse. Some Dell systems go into sleep mode and the Power button goes Yellow, and it will not wake. IN a case like that, the fans will be running. You have to hold the power button for 5 secs and then restart it - Usually when Dells start doing this, it means you gotta get a new power supply, cos this happened with my Dell Precision 370 Workstation.
      My System SpecsSystem Spec

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Fan at full speed during shut down and sleep
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