Fix Cooling Fan is Not Operating Correctly | System Fan 90b Error

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Fix Cooling Fan is Not Operating Correctly | System Fan 90b Error

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Fix Cooling Fan is Not Operating Correctly | System Fan 90b Error

Fix Cooling Fan is Not Operating Correctly | System Fan 90b Error


A cooling fan is a crucial part that cools the system by removing extra heat from it. When you turn on a computer, it's normal for the cooling fan to spin louder and faster until an error code appears on the screen, such as

'' The System has detected that a cooling fan is not operating correctly ''

We must examine the cooling fan's hardware mechanism in order to determine the underlying reason of this problem. A cooling fan typically has three wires connected to it: the red, black, and yellow wires. The fan speed is managed by the yellow wires, which obtain their commands from the Basic Input Output System (BIOS). The BIOS instructs the cooling fan to spin faster when the computer is performing high-end tasks, like gaming, and to spin slower when the machine is idle. Thus, when the cooling fan is not operating any demanding applications, it is typical for it to stop spinning.

The issue arises when the cooling fan, for a variety of reasons, is unable to remove excessive heat from the system. Even though you can ignore this error notice and keep using your computer, it is strongly advised that you take action to correct it since the heat buildup inside the system could potentially damage internal components.

This post will go over how to Fix Cooling Fan is Not Operating Correctly | System Fan 90b Error. The techniques employed here will work with every type of laptop and desktop computer available, including HP devices.

Let's get to the subject,

1. Clean PC Components

There may be dust and other particles lodged inside the cooling fan, causing it to spin more quickly and loudly than usual. 


This would reduce the fan's efficiency. Heat is removed from the CPU and other components by a cooling fan, which then releases it through air vents. 


Over time, the system may acquire dust and other particles from its surroundings, making it more difficult for the fan to remove excess heat. 


This causes the system to overheat eventually, which results in this kind of error. To try to solve this issue, you might try cleaning it.

To accomplish this, 


  1. Turn off your computer and separate the parts
  2. Use an air compressor to remove the dust by blowing a little air into the fans
  3. Next, clean the thermal paste and the air vents using a piece of cloth dipped in an alcohol solution
  4. After putting the parts back together, restart your computer and see if the issue persists

2. Replace Cooling Fan

The cooling fan in aging computers may stop functioning after the manufacturer's guarantee has expired. Therefore, in the event of a dead fan, the system may overheat and immediately shut down to prevent additional harm. 


By placing your ear close to the air vents, you may physically check if your cooling fans are operating correctly. 


If you hear a noise coming from the fan, it is operating correctly. You must run a diagnostic test to look into the fan further if you can't hear any noise coming from it. 


To initiate a diagnostic check, 


  1. Press the F12 key
  2. Choose the diagnostic option, which will start a test that will examine every internal component
  3. To run a memory test, choose No
  4. Next, select "Custom test"
  5. Choose the CPU fan from the apparatus and run the test

The fan may be dead if you receive an error message stating that "Fan the (processor fan) fan failed to respond correctly''. Then, replacing it with a new one could be a possibility. 


A new cooling fan can be bought online or at your neighborhood store. Before making a purchase, be sure to determine the fan's current model.

3. Run a Power / Hard Reset

In addition to hardware issues and malfunctions, corrupted thermal values in the RAM may also result in this cooling fan error. 


You can essentially wipe out all of the system's power and reset all of the thermal values stored in your memory by doing a hard or power reset. 


In order to do a hard reset,


  1. Completely shut down your laptop
  2. Take out the power code and the battery
  3. Disconnect all peripheral parts
  4. Next, hold down the Power button for ten to fifteen seconds
  5. Replace the battery in the laptop
  6. Switch on your PC and launch Windows as usual
  7. Reconnect all of the accessories

You have now completed your system's hard reset successfully.

4. Perform BIOS Reset

The system's Basic Input Output System (BIOS) is responsible for managing the cooling fan and other hardware components. 


CMOS configuration errors can occasionally prevent the fan from operating. 


You can remove the misconfigurations and return to the factory default settings by clearing the CMOS or resetting the BIOS. 

To reset your computer's BIOS, 


  1. Turn on the PC
  2. To access setup, press F2 / F8 / F10 / Del (the key varies depending on your computer type)
  3. Press F9 to access Setup defaults and reset the BIOS when the BIOS loads
  4. To save and exit, press F10

You have now successfully reset the BIOS to its original configuration.

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