How to Troubleshoot a Noisy Fan of PC/Laptop

Common Cause for Abnormal or Loud Fan Noise:

Your laptop’s fan may sound abnormal or loud due to various reasons which are mentioned below:

  • Obstruction in the fan or vent area
  • An out- of-date of BIOS
  • Physical damage
  • Accumulation of dust in the fan or vent area.
  • Usage of laptop not on a flat surface or proper ventilation clearance
  • Using laptop near a heat source or in a hot environment166219-laptopfan_original

Note: Laptop’s fan noise and speed may increase or decrease due to temperature of the system.

Tips for Proper Ventilation:

Proper ventilation is the most important things for your system. If it is not proper then it may increase fan noise as well as heat to the internal parts that may cause damage to its components. Generally users are recommended to use the system in a room temperature of 0°C to 35°C (32°F to 95°F) with a humidity level not greater than 90%. For specific environmental usage temperatures for your system, you can refer the User’s Guide or Owner’s Manual.

Important laptop and desktop specific ventilation tips:


Using a laptop on a hard, flat surface will increase airflow and reduce heat from underneath as well as inside the system.670px-Keep-Your-Laptop-from-Overheating-Step-3-Version-2

Note: Using the laptop on pillow, blanket or other type of cloth will cover up the fan which may cause the system to overheat and may damage your system.

On a regular basis, use compressed air to clean the vents.


When you are using your desktop in an enclosed space may increase its abnormal heat and fan noise.

On a regular basis, use compressed air to clean the vents.

Using a cooling pad can also decrease heat and increase performance

1: Cleaning the Vents

  • Check whether the vents of your system are covered with dust that blocks heat or air to pass through it.
  • On the bottom of the laptop, vent is not blocked with dust in the air intake grille
  • Turn off the system
  • Remove all power sources, unplug the AC adapter and remove the battery or unplug the desktop power cord.
  • Use a compressed air which blows the dust out of the vents.

2: Update the BIOS

You may face problem such as loud fan noise due to out-of-date BIOS. To update BIOS, follow the instructions which are mentioned on your system.

3: Diagnostics Check

You can also perform Full System Diagnostics or Dell Quickest on your computer.