Ground loop or whatever, buzzing noise.

finity4 · February 28, 2020

There's a kinda low but annoying uneven mid-high pitch buzzing in my headphones, started just today, also happened before too but went away. don't know why but it happens even when the pc is off and psu is unplugged from the outlet. i found that if you unplug the monitor from power the noise stops, so somehow the monitor is leaking power through dvi cable to pc, tbh, this doesn't make sense, how does this even work? and is there a way to fix this? whole house is old and ungrounded btw so... can't ground the outlets.. Also a weird thing: just me walking around the pc sometimes stops the noise but moving the cables don't.

oh and i can hear the noise amplified if i touch the backplate with the headphone connector (3,5mm)(same effect when disconnecting dvi: noise disappears) also touching backplate with hand noise disappears too.

edit: noise randomly disappeared (was looking for something in OSD and changed AMA setting then noise disappeared, might just be a coincidence or something with the setting)

edit 2: the noise is back (seems like it comes and goes)

edit 3: noise coming from right psu corner

monitor: benq xl2411z 144hz, psu: integra m 450w, gpu: 1660s.