Computer Noise/Growl

My PC seems to be making this growling noise. I can't seem to figure out what is making the noise, but i do know that it is loud and annoying. It also seems to get louder in a pulsing fashion. plz help

open up the case and make sure you don't have anything stuck in any of your fans.

gpu fan stickers get sucked into the gpu and make that growling noise you described.

I've done that already, it sounds like its coming from my h100i

Might be the pump then. Try unplugging the 3 pin connect that goes to the pump for a few seconds. Definitely the pump if the noise goes away. If not, check to see if anything is caught in the fans.
Have you had a decent dusting in a while?

Ok, I think i found the issue. I can't seem to replicate the noise when the side panel is off, so it seems like it is vibration in the side panel.

What case do you have by the way?
Perhaps simply tightening your thumbscrews or just going down to your hardware store and getting some rubber washers then placing them between the side panel and the case and between the panel and thumb screw may reduce the noise. If you have a window or a fan cover on the side panel, perhaps that has come loose somehow.

I got the h440