Odd High Pitched Noise?

Alexk492

Reputable
Jun 4, 2015
69
0
4,630
I don't know where it is coming from, but every now and then, i hear a weird high pitched noise. The noise reminds me of what it sounds like at night when you go camping. Except a bit faster.

Maybe it is a disk? The noise kinda sounds like it has 2 frequencies, one is constant, and one changes every second, or something. Like, the noise gets more dense for half a second, then waits around 2 seconds, then it gets more dense. Hard to describe.

It was also making this noise when the PC was in sleep mode.
Parts list: https://pcpartpicker.com/user/Alexk492/saved/#view=wcbD4D

Is something obviously wrong? How can i fix this?