Noise comming from my xone:42

[Jayvee]

I'm having a problem...

There's a high pitched noise comming from my mixer at all times.
It doesn't matter wether I have any channels open or not, and it's both in the booth and headphones output...

The problem just was there when I powered it on yesterday, it has never left my room so I have no idea what caused it...

If anyone here knows how to fix it that'd be great!

[Jayvee]

Found the problem!

My laptop was in the same electricity source as my mixer, and somehow this caused noise.
Swapping the charger of my laptop with another one fixed the problem.