High pitch noise coming from PC, please help.

Hey guys,

In the last few days my PC started making a high pitch noise which is driving me crazy! It all started when i installed two new Samsung F3 1TB drives. I already had two of them before but i needed extra space. The noise is still there even if i unplug the new drives. The noise appears only when the windows sreen shows up, so it's possible that it's the graphics card?

The noise is even stronger with one of the new drives running. I don't know if it's because both new F3 hard drives sound louder than the old two and they also produce some high whistle noise, not like the other high pitch im talking about but it's also annoying and they maybe become stronger together.

How on the earth can, both new Samsung F3 sound so different to my old two. Old two are from 03.2011, new from 09.2011, such a small difference and yet the new sound terrible compared to the old two.

I also hear a high pitch noise from my Corsair AX750 psu when the PC is turned off but the psu is still under power, if i take away the power from the psu with it's power button, then the noise dissapears but this noise is a bi different from the other one. It's constant and not changing and i can't hear it when the pc is running. The other noise that annoys me is constantly changing the sound, it's louder, then more silent or almost disappears. I really don't know where exactyl does it come from, but it sounds near the gpu and cpu but it could also be the motherboard, it's hard to locate it.

It's so frustrating not to know which componente is causing this because i really can't listen to this noise anymore, it's hurthing my ears. My PC is very silent so every weird sound becomes annoying very fast

I bought my PC in the middle of 2011 and the specs are listen in my profile.

I tried a few things, stoped all fans, nothing changed, swaped the graphics card, still the same. I think it's not psu, the sound doesn't come from it, it's near the cpu and motherbaord. I think that it's the motherboard which is the worst of all I don't want to exchange the motherboard just because of this, too much work, especially with the thermalright cpu cooler but the high pitch is really annoying, especially because it's changing so much and it's really high, a pain for the ears. I also disconected everyting from the usb and network ports, erven tried to connect the hard drives to different sata ports, noting changed the pitch was still there.

Thanks everyone, will try out this things tommorow.