This document is for HP Notebook PCs.
When a computer fan spins loudly for a long period of time, there might be an issue with a fan, or the computer might be overheating. Adjust the power settings, clean the fan vents, check for suspicious processes, and then update the BIOS to help reduce the internal temperature.
note:It is normal for the fans to spin loudly for five to twenty seconds when the computer initially turns on.