Isolate PC - Guitar picking up electric noises when recording :(

Hi there. I was hoping you guys could help me with this problem I'm having.

I recently built a Hackintosh (went to it from my MBP Retina) to be the main computer at my studio but my PRS Custom 22 guitar picks up so much noise from it that I can't really record anything. I record straight to my UAD interface via Kemper Profiling amp (XLR to XLR). I'm 100% sure it's the guitar pickups that are so sensitive and therfor they pick up all kinds of electric/static/crackle noise. I'm also 90% sure that it's picking up my hard drive noise because when I hit ''play'' in Pro Tools I can hear extra noises come in and when I press ''stopp'' those sounds go away. If I would have to describe the noises I would say they are like having a little Star Wars fight inside your speakers. When I turn off the PC and just play through my UAD audio interface (for monitoring) or plug my headphones to the Kemper I have zero noise so I'm 100% it's the PC.

I NEVER had this problem with my MBP. The noise goes away if I go 2 meters back but that isn't a good solution because I have to be able to reach my keybord and mouse to press record and do all sorts of things while recording.

I've tried pretty much everything I can think of for the past 2 days. I have tried:

*Change the guitar cable
*Change the power cable of the amp
*Turn off all electric things in my studio (monitors, speakers, hard drives) except my PC
*Move my PC to the other side of the room and 70cm farther away from where I sit
*Plug the PC to another power outlet in the room.
*Ground lift on my amp

Nothing has solved my problem. So what can I do to ''isolate'' my PC hardware from interfering with my guitar pick ups? Someone suggested buying a dedicated Furman power conditioner to ''clean up'' my electricity but I don't think it has anything to do with that. It's the PC hardware (some of it at least) that are sending some magnetic signals and stuff. Another one told me to wrap the sides of the PC with aluminum foil. Isn't that dangerous?

Do you have any recommendations for me to solve this problem? Thanks in advance!

Hey, sorry for reviving an old thread. I might have a similar issue, it doesn't matter which guitar (and pickups) I'm using, which cable, etc... I also play and record through a kemper connected into rme fireface. Even tried going direct into instrument input on rme.
I don't have this problem when recording on a macbook, but my pc goes crazy whenever I move a mouse, or open a file, or right click, whenever something's happening on the screen.
The difference is, I have 2 ssd's inside, no storage with moving parts. The PSU sure is dirty when I put my guitar close to it, but this sounds like something a CPU is making, although it doesn't really make sense, what movable parts are causing it?!?
I tried capturing those short bursts but as soon as I fired up screen capturing software it went on without stopping.
So, is your noise something like this?

So I got the solution... For all of you who have this problem, for me it was the combination of two things that solved it.
First one is - reduce the mouse polling rate from 1000 Hz (if you have a mouse that is capable of 1K, or just don't use the mouse when recording/playing), and the second - disable C1E, C3 and C6 states in UEFI/BIOS. It worked for my configuration, no high-pitched noise anymore.