[SOLVED] Low noisy frequency sound coming out from my case

[imicek]

Hey,
just had my new pc close to my ears (like 0.5m from the case) and I'm hearing all the time like low noise frequency sound, something like transformer, but I don't know exactly, what it could be and what to do with that. It time to time stops, but It's that low frequency, that makes my head explode.
I think It can't be normal case fan or processor fan, so the only thing that could be doing it is GPU?
Thanks.

Edit: Tried turning off other fans even the CPU one and all of the graphic card ones too. It's something in graphic card, probably coilwhine, but somehow not loud, but really high frequency.

 

[Aeacus]

The sound you hear is most likely coil whine.

Out of 100% of all coil whine cases; 60% is usually from PSU, 30% from GPU, 9% from MoBo and 1% is always reserved for a ghost in the machine.

Fix: replace the component and pick different brand/model.