There are a few steps to follow if your laptop’s fan is making a grinding noise.

1. Turn off the laptop and unplug the power cord.
2. Disconnect all cables and peripherals attached to the laptop.
3. Put the laptop on a flat surface and take off the cover of its back.
4. Clean the fan using a can of compressed air.
5. Reassemble the laptop and reconnect all cables and peripherals.
6. Turn on the laptop.