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Windows 7: CPU/Case Fans not working

02 Feb 2011   #1
WartHog

Windows 7 Ultimate x64 SP1
 
 
CPU/Case Fans not working

I'm putting my rig together https://www.sevenforums.com/overclocking-case-mods/137435-rig-build.html. Got everything installed and hit the power button. The PSU is running, I get one beep from POST. No case fans are running and the CPU fan looks like it tries to start, but not engaging. Nothing is showing up on my monitors either.

Any ideas? I sure do thank you for your time.

Beau


My System SpecsSystem Spec
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02 Feb 2011   #2
Dwarf

Windows 8.1 Pro RTM x64
 
 

Hi Beau,

Disconnect all PSU cables and then check the mounting of your motherboard to ensure that it is not shorting anywhere on its mountings. Ensure that the CPU fan is installed and plugged in correctly. Plug in the PSU cables to your motherboard only and try to start up. Does your CPU fan now spin? If so, power down and add one peripheral at a time to the PSU, starting with case fans. Each time, test by powering up.

Also, while testing, remove your graphics card and use the on-board instead. Basically, we are trying to eliminate faulty components which can affect the stability of the power rails.
My System SpecsSystem Spec
02 Feb 2011   #3
WartHog

Windows 7 Ultimate x64 SP1
 
 

Thanks for the quick reply Dwarf. So far I have tried the RAM, peripherals, fans, etc... Nothing seems to make a difference.
My System SpecsSystem Spec
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02 Feb 2011   #4
Dwarf

Windows 8.1 Pro RTM x64
 
 

Have you got an alternative PSU you can try, just to eliminate the PSU itself?
My System SpecsSystem Spec
02 Feb 2011   #5
WartHog

Windows 7 Ultimate x64 SP1
 
 

I took the PSU out of another rig. It was running today. I also just subbed in some known good RAM - also running in the other rig today.
My System SpecsSystem Spec
02 Feb 2011   #6
Dwarf

Windows 8.1 Pro RTM x64
 
 

Do the fans work now?
My System SpecsSystem Spec
02 Feb 2011   #7
WartHog

Windows 7 Ultimate x64 SP1
 
 

After trying everything else, I took the CMOS battery out and the CPU fan is now running. Thank you so much for all the help!!
My System SpecsSystem Spec
02 Feb 2011   #8
Dwarf

Windows 8.1 Pro RTM x64
 
 

Check that battery to ensure that it isn't dead. You should replace this battery, otherwise resetting BIOS parameters every time you boot will become tiresome.
My System SpecsSystem Spec
02 Feb 2011   #9
WartHog

Windows 7 Ultimate x64 SP1
 
 

Good advice. I changed the battery too. Also figured out the case fan dilemma. I had them plugged into the NB fan header. Gotta be plugged into System fan header. Learning LOTS today!!!
My System SpecsSystem Spec
02 Feb 2011   #10
theog

Microsoft Community Contributor Award Recipient

ME/XP/Vista/Win7
 
 

Well done.
My System SpecsSystem Spec
Reply

 CPU/Case Fans not working




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