Noisy CPU cooling fan

[srshukla]

Hello! Friends

In the night, before shutting down my PC, every thing was fine. But when I started it on next day, its CPU cooling fan is running very fast and making humming noise. Why? And what should I do?

Please help me.

 

[darklord]

Summers are starting, temps are rising which means the ambient temps are higher and hence that can explain why the CPU fan is running fast as your CPU might be getting a bit hot

 

[john_the_ultimate]

Or you can do some cleaning. Dust is the worst enemy of pc components.