Weird static sound after swapping fans

My first guess is that your PSU is not sufficient for the new fans. 2nd guess is a faulty fan. Are you using any fan headers that were not previously used ? Also make sure that the power wires for the fans are not pinched and contacting the motherboard

Hi! Thanks for a quick reply!
I thought about that myself, so i unplugged the fans one by one but the static continued, even tried a restart with just the two cpu fans running.

To give u an idea of my system.

I7 960
Silver Power SP-SS620M 620W PSU
Antec Kuhler H2O 920 (I swapped the two original fans for two Cougar Vortex 120mm, PWM CF-V12HP)
Gigabyte GA-X58A-UD3R
Gainward GeForce GTX 570 1280MB PhysX
I also put in an extra Thermalright TY 141 in the front and have two stock 140 mm fans in the top. For the thermalright i had to use an extensioncord so that it would still reach the pin on the motherboard.

I really have no clue what to do? Should i try a complete system restore?

Other than the weird sound coming from the speakers or headphones the system runs great and have be on for several hours.

staring to sound like a faulty audio jack on the motherboard. Try dropping in an internal audio card and see if the problem persists.

or using front audio jacks if you have them.

I thought about this too, but the sound is weird no matter if i use the onboard card in the back, the front jack (which is the same audio card) and if i use the USB audio card for my headphones.... So it doesn't look like its the card thats the problem...

i think i've narrowed it down a little (very little). It seems as though when i turn on the computer after it being turned of for a long time, or the power cord have been unplugged, the noise is very faint or almost not there at all. Then, after playing audio for a while the static "builds" and get stronger and stronger...

Anyone know what this could mean?

it is some type of electrical current grounding its self through your audio, what it is is almost impossible to tell you.

Separate the fan wiring from the other cables inside the computer.
When cables are too close together, it can cause lots of noises...

Sounds like a static buildup not grounding properly. May have nothing to do with the fans at this point since you've already disconnected them. Look for any screws that are not properly in.

Here is another option that plagued one of my customers with the same thing. Get an electrical outlet tester, and make sure your ground is still good. could be your surge protector is going out, as they do start to fail after a while.

There could be a number of things that could be either slightly shorting out or not grounding right inside your computer or whatever is connected to it.