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How do I hook up the fans?

post #1 of 12
Thread Starter 
When I was building my computer, I was frustrated because my computer wouldn't turn on. Turns out that it's because I was linking up the case fans incorrectly to my motherboard, an ASUS P8P67 (regular).

What I have right now is that I'm connecting all the fans directly to my Power Supply, a Corsair 750W. Unfortunately, this doesn't allow my computer to control the fans since I'm not connecting the fans in any way to the motherboard.

When my computer wouldn't turn on, I was connecting the fans to the Power Supply and the Power Supply to my motherboard.

My question is, how am I supposed to hook up the fans so that my computer can actually turn on with the fans being connected to the motherboard. Thank you!
post #2 of 12
hook them up on fan headers on the board, you can recognise them because of text like pwr_fan, Sys_fan, Cpu_Fan

in your bios you can controll them
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post #3 of 12
You need one hooked up to the CPU_FAN Header, located at the very top of the motherboard (above the socket)

Without a fan connected to the CPU_FAN Header, the motherboard will not (conventionally) boot.
     
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post #4 of 12
I'm confused. In the second paragraph you have all the fans connected to your power supply and I'm assuming your computer turns on.

In the third paragraph you have all the fans connected to the power supply, and the 24 pin and 4/6/8 (whatever your motherboard takes) pin connected to your motherboard to power it and it won't power on.

What's the difference?
post #5 of 12
Thread Starter 
Quote:
Originally Posted by Sonorously View Post
I'm confused. In the second paragraph you have all the fans connected to your power supply and I'm assuming your computer turns on.

In the third paragraph you have all the fans connected to the power supply, and the 24 pin and 4/6/8 (whatever your motherboard takes) pin connected to your motherboard to power it and it won't power on.

What's the difference?
To everyone, I've always had the CPU fan connected.

I'm not taking about the 24 pin and the 8 pin connector, either. I'm talking about the 4-pin male connector called CHA_FAN1. It's supposed to control the fans of the case. I have my fans linked up to a power supply, and the power supply tip has a 4-pin female connector that matches the CHA_FAN1, but when I plug it in, my computer won't start up.
post #6 of 12
You either plug the fans into the PSU, or into the motherboard, not both.

Are you sure the power supply connector is not for floppy disk drive?
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by Thewaster View Post
You either plug the fans into the PSU, or into the motherboard, not both.

Are you sure the power supply connector is not for floppy disk drive?
It has the connectors for the fans, so I think it's for fans.
post #8 of 12
Which power supply is it exactly?
My Corsair AX 750 doesn't come with any fan headers by default, it only has a 4 pin FDD connector.

Are you using Molex to Molex+3/4 PIN splitters to hook up the fans?
Try connecting the fans ONLY to the power supply, although I don't understand what stops you from connecting them right into the motherboard, and only the motherboard.
Edited by Thewaster - 5/7/11 at 11:05am
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post #9 of 12
Thread Starter 
Quote:
Originally Posted by Thewaster View Post
Which power supply is it exactly?
My Corsair AX 750 doesn't come with any fan headers by default, it only has a 4 pin FDD connector.

Are you using Molex to Molex+3/4 PIN splitters to hook up the fans?
Try connecting the fans ONLY to the power supply, although I don't understand what stops you from connecting them right into the motherboard, and only the motherboard.
Mine is a TX750W. What is an FDD connector?

That's what I'm doing now. They are ONLY connected to the power supply, and it works fine, but I'd like to have the motherboard control them to save some energy.
post #10 of 12

Bottom left is a Floppy Disk Drive connector.
I sure hope you didn't plug that into your motherboard, although it should be impossible to do so.

So once again, why don't you connect the fans directly to the motherboard?
There's no way to control them off the PSU without a fan controller.
Edited by Thewaster - 5/7/11 at 11:28am
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