[SOLVED] Case Fan Not Spinning | 6 Easy Steps

Recently, there have been so many users who are complaining about their PC case fan not spinning issue. If you are also suffering from not spinning the CPU fan, front or back case fan, then this tutorial should be an excellent beginning point for determining precisely what is wrong with your computer and fixing it.


If your case fan is not spinning, the problem might be with anything from the fan itself to the motherboard or power supply unit itself. The fan might get blocked with dust and fuzz, which makes it difficult for it to rotate.

Additionally, the cables that go into the fan might get in the path of the fan blades, preventing the fan from spinning (since these fans don’t have much torque). It is also possible that the fault is with your motherboard; if the circuit giving electricity to the fan is burnt or shorted, your fan will be unable to spin properly.

Hence, whatever the reasons might be. In this guide, we are going to show you each and every step on how you can solve this case fan not spinning.

Why is PC Case Fan Not Spinning Properly?

There might be so many reasons why your PC case fan is not spinning properly. It can be the bios issue, dirty fans, motherboard problem, and so on. Some of the most common reasons are given below.

The fan is dirty or jammed

Usually, a fan takes a lot of dust and dirt, through which it may get jammed or clogged. And if you are suffering from the front or rear case fan is not spinning issue, then it is certain that those fans have become very dirty over the time that they cant spin.


Also, due to the fact that these are the locations where fans collect the most debris, and since they do not have a filter, the fans will get blocked in a few months or so. And based on your arrangement, this is a fairly typical problem. So, you won’t have to worry about it. You can just clean the fans to make it work like new.

Incomplete start-up

It is possible that certain fans on your computer’s chassis will not spin correctly if your computer has not been fully booted up. This is because those fans have not been given sufficient current to begin operating. In this case, you can try to restart your computer. If the problem still persists, there might be some issues in the power supply unit.

Problem With The Bios

There are some times when the BIOS on your computer fails to identify or provide power to the fans that have been installed to the case. If you are sure that the problem is from your BIOS, it is recommended that you can try resetting the BIOS and see if this allows you to get the case fan to start up again.

Hardware Failure

By any chance, if you see that your case’s fans have been broken or exposed to water, it is doubtful that you can ever be able to repair or replace those fans. However, as these fans are not very costly and can be simply changed with third-party alternatives, it is advised that you attempt to change them in order to resolve this specific problem.

Disconnection Problem

As you may already know, every casing fan is linked to the motherboard through a four-pin or two-pin connection, which then takes current from the Power Supply Unit. However, there are some fans that are usually attached to the PSU itself and need a four-pin connection.

And in this case, it is recommended that you examine the cables flowing into and out of the casing fans and track them along the way to verify that they are actually linked to the right slots on the motherboard or the power supply unit (PSU).

Problem with the circuitry

If your computer’s case fan or any other fan within the case is not spinning, it is conceivable that the circuit of your motherboard, which is mainly reliable for delivering current to the fan, has been burnt or shorted. And as a result, you can see the computer case fan is not spinning.


That’s why it is recommended that you get your motherboard or circuit board repaired or replaced, and the problem will be solved. Also, if your motherboard is under warranty period, then you can send your board for warranty as well.

How To Fix Case Fan Not Spinning Issue

The computer’s case fan not spinning problem is one of the most common issues out there. And if you are facing this problem right now, there’s nothing to worry about. Follow the below methods to fix the issue easily.

But before we start troubleshooting, there are some basic solutions that may fix your issue.

Here are some essential tasks before fixing case fans:

Check the Power

Check to see whether the power supply unit (PSU) you’re using isn’t outdated or broken since this might prevent it from providing enough power to the motherboard. And this will result in the computer case fan not spinning issue.

If you see that your PSU has been broken or is unable to provide enough power to the motherboard, please get in touch with the shop from where you bought it. If it is under warranty period, send it back to them.

Examining the Fan Header

For the most part, new motherboards include a pair of fan headers that are capable of supplying the necessary amount of electricity needed by the fans. However, it is conceivable that one of these headers is no longer working. It can be because of a power outage or for any other cause. So, it’s a good idea to check whether or not the fan header is functioning properly before moving on to the troubleshooting.

For checking, it would be great if you detach the PC casing and take the PSU out of the computer. And then, follow the cable that connects your FAN to your motherboard; it should be connected directly to a fan header at this point. Now detach the pin fan header and mount it on a different slot on the motherboard.

Now, check if the fan spins or not.

Measure the Voltage

There is another alternative method to check whether the PSU is working properly or not. And that method is to measure the voltage. By using a Volt Meter, you will be able to check if the appropriate Volt is being provided to the FAN by the PSU or by the Motherboard. Pick your voltmeter and connect its two knobs with the fan’s wire and see if it’s providing the correct voltage or not.


Nowadays, most of the fans on the market use 12V, although there are some fans that use 3 to 5 volts. Hence, if you see that PSU is unable to provide the appropriate voltage, then give your power supply to warranty.

How to Fix Case Fan Not Spinning Issue

If you have done the initial troubleshooting that we have given above but still facing the issue, then follow the below steps to fix it.

1. Restart Your Computer

If your problem cannot be resolved by following the above troubleshooting, restarting your computer might be the solution you are looking for. As easy as it seems, sometimes restarting the computer fixes many things automatically.

As the torque of fans is not so strong, even the smallest particles might cause the fan to get stuck, and the impulse from restarting the computer could be what brings it back to life. A finger or a piece of debris may quickly stop the CPU fan from spinning.

The fan will not spin even after you have removed your finger or any other foreign object like dirt or dust from the fan. This is a security feature for the circuit to prevent it from being fried or damaged. And this problem might be resolved by simply restarting your computer.

If you have already done so and still facing the issue, please review our next remedy.

2. Check the Power Sources of Your Fans

 As we previously stated, most latest casing or CPU fans require two distinct sources of electricity in order to function effectively. One is used to power the RGB lights, while the other is used to provide the voltage needed to run the fan.

So, it’s obvious that if one of those wires is misplaced, the fan won’t run properly. So, the very first task for you is to double-check that the fan header on the motherboard and the wires on the fan are installed and performing properly.

If, on the other hand, you are operating the fans via a fan hub, you must ensure that the power supply of the fan header is connected correctly.

3. Clean Your Fans by Using Compressed Air

Fans are infamous for being jammed with dust and debris. Because these fans do not generate a great deal of torque, the accumulation might approach the fan blades and stop them from rotating properly. You may now want to clean your fan by taking it apart and cleaning it.


To do a perfect clean like brand new, you can use compressed air to clean the fan vents. However, make sure that you have blocked the fan blades while air is flowing by compressed air. Because the fan spins at excessively high RPMs (Revolutions per minute), this might cause harm to the motor and generate some current.

4. Clear the Way of Your Fan Blades

As we already know, CPU and front or rear case fans do not generate a great deal of torque. So, if the wire that leads to the fan motor gets tangled, it will prevent the blades from rotating. In this case, you will have to remove your fan and check to see that there are no cables or other obstructions sticking into the blades of the fan.

Also, after figuring the wires out, these should be secured to the edge using adhesive to guarantee that it does not get in the middle of the fan blades anymore.

5. Flash The BIOS

The BIOS of your motherboard is in charge of controlling the fan. So, resting it by a reset will erase any malfunctions and restore the functionality of your fan. To reset/flash your BIOS, follow the below steps:

  • Restart your computer and hit the Del button (If you are using an MSI motherboard) quickly to enter the BIOS setup.
  • When you get to the BIOS screen, look for the Load BIOS defaults option (it’s generally F9) to reset the BIOS.
  • Click Esc or F10, then pick Save and Exit from the menu and press Enter.
  • Now your computer will be restarted. Check to see whether the fan is operating properly again or not.

Resetting the BIOS is also possible by disconnecting all power cords from the CMOS battery and pushing the power switch for at least 30 seconds. It is called the Hard reset.

6. Replace the Fan                                           

If you have done everything you could and the fan still doesn’t spin at all, you should now consider buying a new one. You can minimize your doubt by using your fan on another working computer. And if it doesn’t spin, then it’s certain that your casing fan is damaged.

While buying a new case fan, you are buying a fan that runs on 3 to 5 volts or 12 volts.

Frequently Asked Questions

Does the computer casing fan always spin?

Yes, to keep your CPU cool, the case fans do always spin. If the temperature of your CPU is high, your case fans will also spin rapidly to cool down the temperature.

How to clean a computer fan?

The best way to unclog and clean the case fan is to use compressed air. Because it will blow all the way through the blades and clean it properly, you can also use a brush if you don’t have compressed air.

How often should you clean PC fans?

Usually, you should clean your computer fans every 6 to 12 months.


It is necessary to consult with the service center if the above-mentioned procedures do not resolve the problem. The service center will confirm that the fans are in proper working order. Otherwise, if they are still under warranty, you may always request a replacement.

However, it is highly recommended that you keep a careful eye on the right voltage and RPM of the fans at all times. We hope that this guide has helped you to solve the case fan not spinning issue.