emi Front Panel audio noise

[Uboatfreak]

I have recently moved my desktop PC to where I live during university term time, and I was checking everything is alright after re-assembling it ( since it shipped ot piece by piece) and noticed that when I plugged in my earphones into the front panel audio jack I hear electrical background noise. Plugging the earphone into the back audio jack made the sound dissappear. 

 

I took a lool at the audio cable and it seems tp be alright. I am attaching a photo of my front panel PCB, the audio cable is in the middle. 

 

I did some research online and some people have this problem because the USB front panel cable causes interference. I plugged out the front panel USB cable out of the motherboard and reareanged the audio cable so it is as far way from other cables as possible and the noise was still there. Also, the noise only appears after the Windows logo dissappears at startup. The noise can not be heard during POST or while in BIOS. So it seems it might be a driver problem as well?

 

The sound is most noticeable with mt earphons. If i plug in my Logitech G430 headphons the sound is barely audible. The thing is, I can hear a very similar sound out of my speakers if press my ear against them. 

 

Could this be just because of the electrical power grid being different? The PC and speakers are plugged in a Europlug socket extension lead which is plugged into a Europlug to Type G UK plug adaptor. I do not remember having this problem before, as I usually plug my headphones into a USB port with the surround sound adaptor they have. 

 

I am using Windows 7 Ultimate Edition and my motherboard is an Asrock Z77 Extreme4. 

Edited October 26, 2019 by Uboatfreak