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Windows 7: My CPU fan turns off after computer wakes from sleep mode

04 Mar 2014   #1

Windows 7 64-bit
My CPU fan turns off after computer wakes from sleep mode

I have a rather confusing problem with my newly built PC. The other day I was using my computer and it randomly shutdown on me without warning. I tried to turn it back on but the fans would only start to spin up but it wouldn't post. I let it sit for an hour and everything seemed fine. Then it happened again yesterday. This time I took notice of every detail. The computer seemed pretty hot. I did some testing and I learned that the CPU fan isn't turning on after I take the computer out of sleep mode. I tried all the settings in the BIOS and checked connections but it persists. I also uninstalled all the programs on my system that have fan controllers built in and tried swapping PSUs. Sleep mode is currently disabled. Has anyone ever seen this before? I think that the fan isn't getting enough voltage to get going because it starts to spin and quits about 50%. Sometimes it turns on sometimes nothing. The scary thing is my motherboard didn't give me any warning about the temps and for some reason my computer doesn't report the correct temps in any of my utilities. Bad sensors? Bug in BIOS? I don't know what else to check. Thanks

Gigabyte GA-F2A88XN-Wifi
AMD APU A8-6500
Corsair Vengance 2133
Crucial M500 240gb
Noctua NH-L9a
pico-psu 160XT

My System SpecsSystem Spec
04 Mar 2014   #2

Windows 7 Ultimate x64, & Mac OS X 10.9.2

Are you sure the cpu fan is plugged into the CPU fan header and not a generic fan header, often theres one right next to the CPU one.
My System SpecsSystem Spec
04 Mar 2014   #3

Windows 7 64-bit

Yeah I double checked the manual and it is clearly labeled as the CPU fan header. The motherboard is a Mini-ITX and it only has two fan headers.
My System SpecsSystem Spec

09 Mar 2014   #4

Windows 7 64-bit

I tried messing around with my power settings today in Windows 7 and I still can not figure out what the issue is. My gut tells me that it is a BIOS issues because I also can't get an accurate temperature read with any software.

Does anyone have any input?
My System SpecsSystem Spec
04 Jun 2015   #5


Hi. I'm having exactly the same problem down to every little detail. My motherboard isn't warning me either, I've just set a 60c temp limit which forces an instant shutdown if it reaches 60 degrees. The only think that has worked for me is use a different header and disable fan control completely, because it would just keep overheating and shutting down shortly after a resume from sleep. Did you ever find a solution?

My system:
Gigabyte GA-970A-UD3P Motherboard
8GB G.Skill Trident-X 2400MHz RAM
My System SpecsSystem Spec
04 Jun 2015   #6

Windows 7 64-bit

I have since learned that Windows 7 has a lot of issues with sleep mode on a lot of motherboards. It's a common problem that a lot of people have given up on trying to fix. The fan on my computer wasn't turning back on when waking up. Other components were having issues too. I have disabled sleep and the problem has "gone away". I wish that I could use sleep though. I use log off instead.

My board in particular has issues giving an accurate CPU temp which adds to the problem. The only way I can get an "accurate" temp is in the BIOS. Some programs report 100C at idle others are reporting 15C at idle. I think it's probably a BIOS bug. I updated to the F4 BIOS but it's the same.

I'll never buy a Gigabyte board again. I specially resent that when I bought the board it did not come with the updated BIOS and I had to buy an older CPU to make it work.
My System SpecsSystem Spec
04 Jun 2015   #7
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot

If the A8 APU supplies the core temperature the same way as the FX series CPU, it will always read low, and 15C at idle is not correct, but it is in the range of what would be expected. My FX-8350 reads 12 to 15C at idle. That is not correct, but it does get more accurate under load and high temperature. This is because the core temp is a calculated value with AMD processors. AMD says that the core temp reading is not accurate until after the core surpasses 45 or 48 degrees C, IIRC. This is garbage, because my core will never read right, no matter the temp. It's always 20C too low.

In short, there is nothing wrong with your core temp sensor if you're getting 15C at idle, I suspect. You just have to understand where that number comes from and how to work with it.
My System SpecsSystem Spec
04 Jun 2015   #8

Windows 7 Ultimate x64 SP1

I wonder mine is measuring correct. Core Temp: 23-27C idle. Ambient should be 23-24C. Specs are current.
My System SpecsSystem Spec
04 Jun 2015   #9

Windows 7 Pro x64 Windows 10 Pro x64

Don`t bash the board because some program won`t report accurate cpu temps, the only true readings are in the bios, which you already stated, and I backup that statement 100%'

As far as the bios, you probably could have updated it with a usb stick. Did you look into that before making a cpu purchase ?

If you think there`s anything wrong with the board, by all means, setup an RMA with Gigabyte.

GIGABYTE - Motherboard - Socket FM2+ - GA-F2A88XN-WIFI (rev. 3.0)
My System SpecsSystem Spec
05 Jun 2015   #10
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot

Quote   Quote: Originally Posted by GokAy View Post
I wonder mine is measuring correct. Core Temp: 23-27C idle. Ambient should be 23-24C. Specs are current.
As far as I know, the Phenom 2 series does read correctly. At least my BE 955 always did.

That core temp sounds OK for idle. My 955 had similar temps at idle.
My System SpecsSystem Spec

 My CPU fan turns off after computer wakes from sleep mode

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