My fans won't boot up correctly on start up on my Asus M5A97 LE R2.0 ATX AM3+ Motherboard

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catburritto

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Apr 30, 2017
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hey guys, i have had this problem ever since i've built this pc. Every time I shut my pc down, plug in 3 fans, and turn it on, the fans kind of "die". They won't start spinning and the LEDs in them are dimmer than they're supposed to be. But as soon as i remove one fan from the motherboard, they other two fans start working normally, and if i plug the third fan back in again it too starts working correctly. I don't know if it's the motherboard causing the problem or the fans. Any help would be very appreciated.
 
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catburritto

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Apr 30, 2017
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hello thanks for helping out. I've used both my preinstalled fan that came with the tower and my fans that I bought separately. The same problem still happens.

 
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catburritto

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Apr 30, 2017
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I'm hooking them up to their separate slots in the motherboard. I'll provide a video soon.
 
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catburritto

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Apr 30, 2017
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510
how do I check if they're 3-2 or 4 wire fans?

 
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Paperdoc

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Oct 19, 2006
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Are you using any "low-noise adapters" in the wiring to those fans? Those devices will interfere with normal automatic speed control by a mobo header and should NOT be used. They are for use when yoou plug your fan into a PSU output directly, and need a way to reduce their speed.
 
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catburritto

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Apr 30, 2017
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Not that I know of, I'm just using the 3 pin headers that are connected to the fan.
 
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Ironsounds

Ironsounds

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Jul 31, 2011
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Hello... Nice video B ) ...1) Can you post the website for that corsair fan model? for me...

2) also explain or show me what you are using to turn the fan speed up/down with? there is a point where ~<25% of speed/power to them that will cause theses types/designs of Fans to not have the ability to run... they need a sudden/larger voltage rise to respond...
They are a brushless DC motor... and use Magnetics to turn... and also having the LED's in them will cause different Voltage characteristics in their operation and use... in other words B D you can't run theses types of Fans below a certain speed or Voltage.

That is why you always see your GPU and CPU fan startup at Full speed at boot and THEN slow down... it takes a larger voltage to get them started and they have a minimum Voltage range to keep them operating. B / ...you can not get O% to 100% speed range/control like "Brush" DC motor will give you.

I feel everything is normal and you might be dropping the Voltage to low and explains why when you un-plug one the other Fans start to increase in speed B )
 
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catburritto

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Apr 30, 2017
8
0
510


Here is the two of the three fan models: http://www.tomshardware.com/answers/id-3402077/fans-boot-correctly-start-asus-m5a97-atx-am3-motherboard.html#xtor=EPR-8809
The third fan is just 12V DC 0.38A.
I'm using speed fan to lower and raise the fan speeds. The fans "die" when the speed goes to 85% or less. Also sorry it's taking so long for me to reply, I haven't been getting notified when someone answers.
 
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