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  #1  
Old January 11th, 2018, 08:47 AM
cleardarksky cleardarksky is offline
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Join Date: Oct 2006
Posts: 34
CPU fan loud when PC goes into sleep mode

Every time I place the PC in sleep or hibernation mode, the CPU fan makes a loud noise because it starts spinning faster than usual. I have to unplug the power cable to stop the noise. This happens when i use the "sleep" button on the keyboard or when using the start button then clicking sleep or hibernate. I haven't installed any programs recently or made any changes to the system. It came out of nowhere. The CPU fan seems to work fine when the computer is running and CPU temperature is normal. There is no dust buildup on the fan or the CPU's heat sink. Any help would be appreciated.
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  #2  
Old January 12th, 2018, 07:30 PM
Digerati Digerati is offline
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Are you saying it does not stop spinning fast, even after several minutes in sleep mode?
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  #3  
Old January 14th, 2018, 01:51 AM
Ensign Tzap Ensign Tzap is offline
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Join Date: Jul 2005
O/S: Windows 7 64-bit
Posts: 734
I too am wondering what exactly cleardarksky is asking.

The problem could be related to the FAN Controls in the BIO's settings.
As to why the fan is speeding up when in sleep mode.

Or is it the fan noise has gotten louder, when the fan goes at full speed.
Which would indicate that the bearings are worn out.


Signed: Ensign Tzap
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  #4  
Old January 15th, 2018, 05:59 AM
cleardarksky cleardarksky is offline
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The fan spins "normally" when the computer is on, however when I place it in sleep mode, the fan starts to spin much faster than "normal" which causes a loud fan noise. I have opened the case and I can see and hear the fan making a loud noise, it is the only device inside the case making this noise. I've also noticed the power supply doesn't shut off when the machine is placed in sleep or hibernation. I've left the machine in sleep mode for over 15 minutes, with the fan noise, but it did not go to sleep. For some unknown reason, placing the machine in sleep or hibernation mode, overheats the CPU which cause the fan to kick on, probably trying to cool the CPU.
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