When I have the editor fullscreen and currently my selected app, I get a buzzing sound coming from my PC. It stops as soon as I select any other app or even just click on my desktop. Any ideas?
Sounds like your GPU fan.
You could try opening the case and blasting dust off the fan with a air blower ( depends how old your PC is ).
Also, putting the case at a different angle can help a lot ( flat instead of vertical etc ).