There are a few potential causes for the laptop’s fan not working at all:

1. Check the fan to see if it’s dusty or blocked
2. Check the fan’s connection to the power supply
3. Verify the fan speed settings
4. Check the fan’s airflow vents
5. Ensure the cooling system is in good working condition
6. Check if the fan is properly connected to the motherboard

If none of these potential solutions solve the issue, it could indicate that the fan is broken and needs to be replaced.