Forum Thread

New PC Case Fans Won't Work

wes 1,942 212 October 6, 2015 at 02:52 PM
I just got replacement case fans for my home-built PC, but I can't get them to spin when connected to the motherboard.

I own a Intel DX58SO motherboard, and the case fans that came with the unit were the 4-pin type that connect directly to the power supply. They crapped out awhile ago, so I got some replacement ones that connect to the motherboard. I plugged the fans into the ports the MB manual indicated, but they don't spin up. I've gone in the bios, changed the fan speeds from manual to auto and back, nothing. I've plugged them into the CPU fan slot, and they spin, so there shouldn't be a cut cord or something.

So what do I need to do to get them working? I'll get adapters to plug them straight into the PSU if I must, but I'd rather get them CPU-controlled if I can.

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#2
Post a pic showing where on the mobo the fans are connected
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Marshall: Have the rest of you guys figured out by now that mmathis is the smartest guy on SlickDeals?
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#3
Here's the pic. The case fans are connected to the red spots(don't work) and the CPU fan is connected at the green spot (works)
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#4
FYI, Im not a pro... but make sure your bios is updated and configured correctly. My mobo controls the fans from 0-100%. Also, check if your fans require a separate power cord. If wither of these dont work id replace the fans or mobo.
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#5
Quote from wes View Post :
Here's the pic. The case fans are connected to the red spots(don't work) and the CPU fan is connected at the green spot (works)
That shows where they should be connected, not where they are connected. Take a pic of your actual setup if you can.

Are they 3-pin or 4-pin fans? Do you have them installed in the correct orientation? What temps is your mobo reading? Do you have the 8-pin power connector connected to the board near the CPU?
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#6
These are the fans: http://www.amazon.com/gp/product/...ge_o02_s01

I don't see why they'd need additional power because they're so low, and there were no extra cables other than the 4-pin that were connected to the fans. I played around with the fan settings in the bios but no positive effect.
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#7
Quote from mmathis View Post :
That shows where they should be connected, not where they are connected. Take a pic of your actual setup if you can.

Are they 3-pin or 4-pin fans? Do you have them installed in the correct orientation? What temps is your mobo reading? Do you have the 8-pin power connector connected to the board near the CPU?
They are both 4-pin. Where I circled is where I have them connected. Here's a pic of the inside, I didn't do it earlier because it's a mess. I have the power connections right according to the manual. SpeedFan is reading CPU temp of -48?C and an internal temp of 41?C. Don't know of any other temp that would matter.
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#8
Ok...the 4th pin (on your case fan) is used for PWM which automatically adjust your fan speed based on the temperature. That is why the 4th pin exists.

If you want to use your PWM fan, you will need to connect it to a 4-pin fan connectors on your motherboard. You can definitely still connect it via the right diagram of the image you show on "Connecting Chassis Fan Cables". It will not have the PWM feature though which is the same as connecting via power supply.
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#9
There's only one 4-pin connection on the board. I got the other aligned right on the 3-pin I marked according to the groves on the cable I believe. But I can't get them to spin no matter what I input into the computer. I even tell the bios to spin them 100% all the time and it does nothing. I want the motherboard to tell them to spin one way or another
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#10
Quote from wes View Post :
They are both 4-pin. Where I circled is where I have them connected. Here's a pic of the inside, I didn't do it earlier because it's a mess. I have the power connections right according to the manual. SpeedFan is reading CPU temp of -48?C and an internal temp of 41?C. Don't know of any other temp that would matter.
If you are sure of this then it sounds like the board is damaged. The fan works on the CPU fan header, so it's not a problem with the fan itself; the temps are high enough that the fans should be spinning at least a little if PWM-controlled; and if you are sure the BIOS settings are correct, the fans should be spinning at whatever speed you set them to in manual mode.

Given your CPU temp of -48C, I'd suspect something else is wrong with the board, too Wink
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#11
I'm sure there's alot of things wrong with this PC: all I'm doing in my life is fixing my broken stuff!(I don't even want to go into my car repair cost...) I'm just trying to keep this thing chugging until at least Black Friday, so I got the new fans - that I can't get to work.
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#12
Quote from mmathis View Post :
If you are sure of this then it sounds like the board is damaged. The fan works on the CPU fan header, so it's not a problem with the fan itself; the temps are high enough that the fans should be spinning at least a little if PWM-controlled; and if you are sure the BIOS settings are correct, the fans should be spinning at whatever speed you set them to in manual mode.

Given your CPU temp of -48C, I'd suspect something else is wrong with the board, too
Yea, i totally agree with this.

Although from experience -48C from speedfan is normal. Their program has flaws. Some of the temp they outputted are buggy.
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#13
Let me post the readings. I'm probably goofing on that.
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#14
Quote from wes View Post :
I'm sure there's alot of things wrong with this PC: all I'm doing in my life is fixing my broken stuff!(I don't even want to go into my car repair cost...) I'm just trying to keep this thing chugging until at least Black Friday, so I got the new fans - that I can't get to work.
Totally understand! Just keep the case door open and remove the fan. You dont need that fan seriously!

I had that fan turned off with mine and opened the case. Although, it is due to CPU fan being too strong
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