I've had this problem for quite a while now and I can't seem to find the source.
This guy explains it quite well (1st post): http://community.futuremark.com/forum/showthread.php?135917-HELP!-Computer-makes-static-noises-when
The sound varies in pitch and goes crazy when I watch video or play a game (raising volume so that the game or music cancels the sound out is what I'm doing now to prevent me from going insane).
I suspect the problem is my amplifier since the noise is gone immediataly when I turn it off.
This is my audio setup:
USB Behringer U-PHONO UFO202
red-white tulip audio cable
Numark DXM06 Digital mixer
Red-white tulip audio cable
Skytek SPL 500(watt) amp
Stripped audio cable (no jacks)
Magnat Monitor 2000 speakers
Some cables are crossing (interference?) so that might be a cause of the problem, but there's more.
This is my PC electricity situation:
Not grounded wall socket ( )
Remote controlled switch for wall socket
Techno Line power consume meter (or so)
Cable to an electricity socket bar
Power cable to PSU
The second thing is also quite annoying. I'm a streamer on Twitch.tv so I use my headset/microphone a lot. Recently I had to switch to the microphone built into my webcam because there is a lot of buzz through the mic (low humm) when I use my USB Headset. I could work around it by using a noisegate that opens the mic whenever a certain volume is reached (by speaking), but that doesn't work anymore since the buz is there constantly.
I think this has something to do with grounding because whenever I touch my PC the buzzing gets less. I even had a small copper cable (video below) attached to my PC and to my radiator. That way the buzz was almost gone (still static through speakers though). However that workaround doesn't really work anymore and I don't want to play around with workarounds anymore.
I was pretty much shocked (no pun intended) to see what happened when I connected the cable, attached with tape to a slightly scratched part on my pc, to my radiator:
What'd you do to try to fix it?
For the buzzing: I replaced my PSU, Blew out the dust, checked for faulty cables hanging on the motherboard/pc casing, tried a different USB port (for the buzzing), Reinstalled windows (not really to fix this, but still).
For the Noise: See above, also reconnected powercables, tried putting the powercable and audiocable apart from each other wich was quite hard to do with this setup so might have failed there.
Reading this makes me feel a little bit stupid. I think the problem is in all the things I just mentionned. The whole system and set is probably all wrong, but there might also be a different problem wich might explain random slowness of my system, random crashes, not being able to boot up in 1 try and such. It's probably all 'connected'.
Edited by marcodaz, 23 November 2014 - 12:14 PM.