since last night pc making noise humming sound

[mrtrout]

have not heard this sound for months now it cameback last night will try to clean inside pc might help  :  :

[tregs_beales]

Mine does so during really cold days. It starts when I turn on pc then after minute or so hums really loud. After 2-3 mins noise gradually decreases & goes back to normal.

[clyde]

Take the back off and have a look.

[daljeet]

Check your computer fan and  your computer case it happens computer case shaking with other components

[scolli23]

Can of air- blow out the  heat sinks

[mrtrout]

Can of air- blow out the  heat sinks

I did this yesterday there was some dirt on the bottom of the inside of the computer & there was some dust in the fan inside pc i cleaned it out blew it out but sound is still buzzing it did not go away computer running too warm too fan is working too hard it seems pc getting old i need a new one

[baziroll]

change your fan
or remove Sticker from front fan and put a little Oil and add Sticker to it again