CPU fan goes off and on

[asdewq]

Hi, My computer CPU fan goes normal then after few seconds starts to go like crazy , stops and keeps doing this over and over again , CPU usage is at 1-10% it happens every time no matter what I do , could any one help ???

 

[norcalsc]

Is this a custom build? What you can do is go into bios and change fan settings to quiet. I asked about being a custom build because you may have plugged a case fan into opt cpu header. Are you monitoring temps as well?

also list your specs please, it's hard to help when pieces of puzzle are missing

 

[asdewq]

It's a laptop and it's basic, haven't changed anything , just few days ago this started to happen. Before everything was OK even when I was playing something or doing stuff.