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Laptop fan starts then stops, no bootCPU fan spins briefly, system shuts down

Experiencing issues with your laptop fan starting then stopping, or the CPU fan spinning briefly before the system shuts down? Read on to learn about possible causes and solutions for these frustrating problems.

Power Supply Problems

First, check if the power supply unit is functioning properly by using a voltemeter to measure the voltage output. If the voltage is not within the normal range, it could be causing the issue.

Next, try using a different battery charger to see if the problem lies with the charger itself. If the laptop still doesn’t boot up, it may be a problem with the motherboard or central processing unit.

If you are comfortable doing so, you can try reseating the CPU and checking for any loose connections on the motherboard. If the issue persists, it may be best to consult a professional technician to diagnose and fix the problem.

Cooling System Malfunctions

Check the laptop’s cooling system for any malfunctions. Make sure the CPU fan is functioning properly and not obstructed.

If the fan starts spinning briefly and then stops, it could be a sign of overheating. Check the laptop’s vents for any dust or debris that may be blocking airflow.

Additionally, check the laptop’s BIOS settings to ensure that the fan is set to run continuously at an appropriate speed. This can help prevent overheating and system shutdowns.

If the fan continues to stop after cleaning and adjusting settings, consider testing the fan with a voltmeter to determine if it is receiving power properly.

In some cases, a malfunctioning power supply unit can also cause the fan to stop spinning. Check the power supply unit and battery charger to ensure they are working correctly.

If the issue persists, it may be necessary to contact the laptop’s manufacturer for further assistance or to replace the fan if needed.

BIOS and Hardware Issues

Issue Cause Solution
Laptop fan starts then stops, no boot Overheating, faulty fan, BIOS settings Check for dust in fan, replace faulty fan, update BIOS
CPU fan spins briefly, system shuts down Overheating, power supply issues, hardware failure Check CPU temperature, replace power supply, troubleshoot hardware components

Troubleshooting Steps

  • Listen for any unusual sounds or vibrations coming from the laptop fan.
  • Feel the bottom of the laptop to see if it is getting hot.
  • Check if the laptop is placed on a flat surface to allow proper air flow.

Clean the fan and vents

  • Turn off the laptop and unplug it from the power source.
  • Use a can of compressed air to blow out any dust or debris from the fan and vents.
  • Gently wipe the fan blades with a soft cloth to remove any remaining dust.

Update BIOS and drivers

  • Access the manufacturer’s website and search for the latest BIOS and driver updates for your laptop model.
  • Download and install the updates following the manufacturer’s instructions.
  • Restart the laptop to apply the changes.


Why does my laptop fan turn on then off?

Your laptop fan turns on then off because modern laptops are designed to adjust fan speed dynamically based on the internal temperature. When the CPU or GPU get hot during heavier processing tasks, the fan kicks in to cool it down. Once the temperature drops, the fan turns off again. This is normal and healthy for the laptop.

Why does my computer fan start and stop immediately?

Your computer fan starts and stops immediately due to potential issues with the power supply unit (PSU), motherboard, or CPU. Inadequate power supply from the PSU or malfunctions in the motherboard or CPU can cause this erratic behavior.

Why is my laptop not opening but the fan is running?

Your laptop may not be opening because of a residual power issue, which is a common occurrence with laptops. If the fan is running but the laptop won’t turn on, it may indicate a hardware problem that needs to be addressed by a technician.

Why is my computer not booting but the fan is spinning?

Your computer is not booting but the fan is spinning because there may be an issue with the power supply.

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