High pitch noise & buzzing from motherboard or psu.

[rapidisimo]

Recently I decided to upgrade from an amd opteron 932 to a i7 920.

These are my components

http://www.newegg.com/Product/Product.aspx?Item=N82E16813128374
GIGABYTE GA-EX58-UD4P
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119160
COOLER MASTER HAF 932
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227381
OCZ Platinum 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115202
Intel Core i7 920 Nehalem 2.66GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233029
XIGMATEK Dark Knight

Other things inside the case are three hard drives, two are 640g and one is a 150GB raptor along with an ATI 4850 vid card.

I decided to keep my older power supply since it's 600w and thought it would be enough to handle the upgrade.
Here is the link: http://www.newegg.com/Product/Product.aspx?Item=N82E16817151025
SeaSonic S12-600

Once I got things running (win7RC) all was well until I started to hear a high pitched buzz. I tried to see where it came from but it's hard to determine if it's the mother board or the PSU as many suggest.

Through testing I've managed to make it go away, what I did was turn off/modify various settings in the bios. Then I proceeded to turning them back on such as power settings and CPU settings.
The last thing that I didn't restore was the CPU auto voltage, when it was on auto the setting was at 1.2555V but I switched it to 1.2000 and I think that's what made the buzzing noise stop.

Now my question is what's the best way to resolve this?
Get a better power supply or is it the mother board? (do more testing?) Return the mobo?

Thanks

Misc: The buzzing is when the computer boots windows and it usually stays while using the OS. It doesn't do it while in a bios screen.
When I was using my amd 932 it never happened and the i7 is at stock speed as well.

 

[Pointertovoid]

Stop shortly one fan at a time with your fingers and you'll know which one is loud. Don't forget the graphics card.

For the power supply, use an insulating tool like a wooden stick.

 

[dudleydooright]

I have the same fan noise in my HP Pavillion. The best I can determine is the cpu fan. HP wants me to send it to 3rd party repair service and "refurbish" it, which means they want to take it back to factory settings. I just want to find the heat sink fan and replace it myself. Trouble is, I can't find one . The board is a Pegatron M2NL789-A. Any advice would be appreciated.

Thanks !

 

[TimonJvc]

The last high pitch noise I had, emanated from the Antec psu. Talk about actually hurting your ears!
Replaced it with a decent Corsair mdl and all was/is well