Buzzing Noise at lower part of PC

[MapleE.]

Hi:
There is 'buzzing noise,' at the bottom part of PC while PC is on.

It's not loud, a kind of 'faint,' but still quite annoying and this started
two days ago or so. Once turning-off and starting on the PC, the noise
seems to go away, ... but frequency seems getting bad.

Is this to be 'inside of fans' going bad?

Thanks for your help in advance.

 

[Leonard Grey]

If the buzzing sound is coming from inside the computer case, the most
likely source is one of the cooling fans. If you're lucky, all you'll
need to do is to open the case and *carefully* clean out the dust and
debris.

 

[Guest]

Adding to this, see if there is touching cable to the moving part for the
cooling fans or any loose connection there.
HTH.
nass