Hey, I bought a pc 5 days ago, and it makes a weird, not so loud, but annoying crackling noise. I do not really know what indicates it. When I open a game, I always hear it for a couple of seconds, and then it goes randomly again.
You can listen to it here: http://www110.zippyshare.com/v/o5KwCmAR/file.html
You can listen to it here: http://www110.zippyshare.com/v/o5KwCmAR/file.html