Odd pitched noise on my computer - help me please!

Galinho13

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Feb 22, 2014
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Hey guys!
Well, I've found a new problem that is bothering me a lot! I've some kind of OCD, so...
The problem I found is an odd pitched noise that is coming from my motherboard. I'm not pretty sure though if it's the motherboard; some people told me that could be the PSU. But, when I put my head close to my case, I can tell that the noise is like coming from a green light led on the Mobo.
How can I solve this issue? Is it normal to have a not-so-loud noise coming from the computer? This noise is so audible as the cpu fan (I'd say it's louder, but not that much). It only disappears when I turn my nobreak off.

I heard that maybe, if I disable overspeed technology, it could solve this problem? Is that true? If yes, how do I do it? I already disabled speedstep, but it didn't seem to work.

My specs:

Intel Core I5 3330
Mobo Asus P8B75M
500GB HD SATA III 7.2RPM WD
GTX 650
8GB RAM DDR3 1333 MHz
PSU 550W
Case GS-6010
 

Galinho13

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Feb 22, 2014
44
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18,530
Hey guys, i figured out that maybe this problem is caused by the Ethernet cable. When I unplug it completely, the only thing I hear at all is my FAN. When I plug the ethernet cable, I hear the odd noise coming again. It's like a bzzz bzzz (dog whistle) oscilating second by second.
Is this even normal? I'm really close to my case