This document pertains to HP and Compaq Desktop PCs with Windows Vista.
A computer contains several fans to keep it cool. When a computer is first turned on, the fans normally spin at high speed and create some noise. After 5 to 20 seconds, however, the fan noise stops.
Fans that continue to spin at high speed or make strange noises might indicate a problem. If the fan is still noisy after 20 seconds or if a fan suddenly starts making unusual noises, use the following steps to troubleshoot for problems.