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4 pin cpu fan wont work on 4 pin connector

Last response: in CPUs
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October 30, 2010 4:22:49 PM

Alright this is my heatsink:http://www.newegg.com/Product/Product.aspx?Item=N82E168...

this is my mobo:http://www.newegg.com/Product/Product.aspx?Item=N82E168...

One day when I went to turn on my computer the cpu fan wouldn't spin even though it was connected to the 4 pin cpu fan connector on the mobo. First, I made sure everything was connected and it was so I tried putting the fan on the 3 pin fan connecctor and it worked but the fan runs at 100%. And it gets noisy. So i was wondering if there is a fan controller or adapter that you can use with a 4 pin cpu fan.
I also tried putting a 3 pin fan on the 4 pin cpu fan connector and it worked but ran 100%.
a b à CPUs
October 30, 2010 4:37:45 PM

Sounds like the PWM signal coming on the 4th pin is either not working (so the fan thinks it's being informed to stay off) or the CPU fan is set to be off in the BIOS.

Check the BIOS first to see if there's anything unusual regarding the CPU fan before you look at a fan controller.
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October 30, 2010 4:42:05 PM

Yeah I want to make sure the problem is with the connector on the motherboard not with the connector of the fan.
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a c 99 à CPUs
October 31, 2010 12:27:24 AM

Gmoney39513 said:
Alright this is my heatsink:http://www.newegg.com/Product/Product.aspx?Item=N82E168...

this is my mobo:http://www.newegg.com/Product/Product.aspx?Item=N82E168...

One day when I went to turn on my computer the cpu fan wouldn't spin even though it was connected to the 4 pin cpu fan connector on the mobo. First, I made sure everything was connected and it was so I tried putting the fan on the 3 pin fan connecctor and it worked but the fan runs at 100%. And it gets noisy. So i was wondering if there is a fan controller or adapter that you can use with a 4 pin cpu fan.
I also tried putting a 3 pin fan on the 4 pin cpu fan connector and it worked but ran 100%.


I'd check to see if there are any BIOS options or motherboard jumpers set anywhere that enable or disable PWM fan operation. They may say "3-pin fan/4-pin fan" or something like that, just make sure they're all set to 4-pin. I'd also look at your fan speed control settings as it could be you have thermally-controlled fans that simply do not turn on until the machine gets to a certain temperature. Generally a 3-pin fan plugged into a 4-pin port set to PWM operation will run at 100% speed, which is what you see and would suggest your motherboard is working in PWM mode. But you could also have it set in 3-pin mode and have the fan speed control set to 100%, so just go look in the BIOS and on the board for any fan control settings.
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