The noise still there. My CPU only using standard fan and the chipset doesn't have a fan on it. Do you have anything else that I could try?
The noise is still there now, or it was still there while the fans were blocked?
If noise still there while stopping a fan, that particular fan is not the culprit. If the noise stops while the fan is stopped, you got it.
Don't forget the fan inside the PSU and the GPU cooler, as well.