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CPU fan not turning with ATX 12V connector plugged in

The power supply fan and CPU fan won't turn with the ATX 12v connector plugged in. Unplug the 12V connector, CPU fan and power supply fan turning but of course not startup.

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Re: CPU fan not turning with ATX 12V connector plugged in

With the fans on its drawing more than the PSU has.The PSU is bad. Replace it. If it still happens please let us know...It shouldnt.

Posted on Jan 06, 2008

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Re: CPU fan not turning with ATX 12V connector plugged in

U also tell which company motherboard u install.when u pulgged it got earthing . I face this problem with ASUS + AMD kit . This problem solve by doing proper earthing at 100 feet depth.

Posted on Jan 09, 2008

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3 Answers

12v ATX Power Connector connected to series GA-81HXP motherboard and CPU only causes ATX power supply to shutdown. Disconnect 12v ATX connector, back to normal.

"To ensure suffiient power can be supplied to your system, it is
recommended that a power supply of good quality be used. If a power
supply is used that does not provide the required power, the result can
lead to an unstable or unbootable system."

Apr 13, 2015 | Gigabyte Motherboards

1 Answer

Intel fw82801db

on your board theres is a spot where the fan from the cpu goes it saids cpu fan on the board near by cpu socket

Aug 06, 2013 | Asrock Motherboards

2 Answers

Hi, Is the 24 pin power connection on the MB the only power connection to the supply? Or are there others? Thanks!

no there is a 12v plug across the board from the first power connector.
It is an optional plug that only serves to distribute the load into
a couple of other wires for heat dissipation, so they don't burn up.

Aug 13, 2011 | Biostar N68S3B GeForce 7025 Motherboard...

1 Answer

This is my first build and all the connections are a bit confussing need picts of how to install cables to hardware

The following picture will definitely help you to install new power supply.
The 4 pin CPU power connector is using in most of the desktop motherboard. If your motherboard is gaming type or workstation board you need to connect 8pin CPU power connector. Molex connectors are using to power up DVD Drives and HDDs. In New model power supply instead of molex connector SATA Power connectors are coming.

Feb 12, 2011 | Thermaltake Toughpower XT TPX675M 675W ATX...

2 Answers

I've got a new Gigabyte Ga-M68Mt-D3 mobo paired with a cooler master 460 watt power supple. Cpu is Amd phenom II 3.2 ghz with 4 gig of DDR3 ram. I powered up the supply attached to my ATX power supply...

Most motherboards now have a 24-pin power supply connector. If you haven't already found a diagram showing the pinouts of the 20- and 24-pin power plugs, here's one borrowed from a handy site:


The two plugs are essentially the same, but the 24-pin version duplicates some voltages on the extra pins. The extra pins in the larger connector were meant to provide extra current paths for voltages that see heavy loads from newer processors and motherboard circuitry. Depending on how a motherboard is designed, it might work with a 20-pin plug connected (leaving pins 11, 12, 23 and 24 empty). But typically if the board has a 24-pin connector it needs the 24-pin power supply plug.

Most power supplies have a 20-pin plug with a separate 4-pin section that fastens to it for connection to a 24-pin mobo connector. It typically has one side designed to slide onto the end of the 20-pin plug, essentially turning it into the 24-pin version. This added plug does not have a retaining clamp on its side, so you can tell it from the the 4-pin CPU power plug. The wire colors are also different. For reference, here is the processor power plug, from the same website:

New motherboard specs call for the separate processor power connector for the same reason the extra pins were added to the power supply connector: to handle the high currents needed by increasingly faster CPUs.

When the motherboard has these connectors, you need to use them all to get everything working. Hope this helps. Thanks to for the diagrams, and thank you for using Fixya.


Nov 19, 2010 | Motherboards

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System won't turn on but when i pushg down on one side of the power suply connectore the fan starts running but computer stioll won't turn on it used to boot up then opne day stopped

It sounds like you have a faulty connector - I would return the item under warranty. Otherwise, if it is out of warranty, you will have to source a new motherboard.


3 Answers

Motherboard power problem due to atx 12v cable

I tried different power supply but its still not powering up. But when i remove the 4 pin 12V cable from power supply the cpu fan is rolling, it means that the power supply is working but when i tried to connect the 4 pin then the cpu fan stop just a second and never rolled on. The main problem is the 4 pin, the model is Asus P5P800-VM. I tried to reset the cmos and replaced the battery but it wont work out. Please help me!!!

Jun 09, 2009 | ASUS P5P800-VM Motherboard

2 Answers

PS_ON revertsto high as soon as +12V starts to appear on 2+2connector

usually it is over-current that will make PS_ON go high. However, the opposite is true: if not enough load draw, PS_ON goes high and never goes low. Not exactly certain about link to 12V2+2 connector, although same theory may apply.

Nov 19, 2007 | Intel ASUS P4C800-E Deluxe 875P Socket 478...

2 Answers

Asrock dual core 775 vsta motherboard

Since the only thing connected is the power suppy and the CPU, this is often caused by a power supply unable to provide the power to the MB. You will need to swap out the power supply and that should take care of the problem.

Jun 22, 2007 | Asrock 775Dual-915GL Motherboard

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