General "Mini Air Cooling Fan" big fan noise is due to internal power supply oil into the dust caused by dry or if your computer maintenance personnel in the security breaking oil can, such as self-treatment can remove the power supply fan, opened oil seal label must be cleaned and oiled clean stickers at the accounting firm. If it is "Mini Air Cooling Fan", is generally poor or fixed resonance or oil dry, due into dust. Fixed and resonance problems, you can re-unloading and reloading or add shims; problems in the case of oil in accordance with the above operation refueling. Will sound a quiet good, if not always loud or sudden loud words quickly for "Mini Air Cooling Fan".