Audio buzzing during certain games

[ubuu]

When I'm loading Civ 5, Sims 3 and Sims 2, I can hear loud buzzing/screeching form inside my case. It only occurs when first loading the games, not like when I'm actually in a household in Sims or moving units in Civ, and stops if I bring up another window when they're loading. As soon as a switch back to their window, though, the sounds start again. I'm well above required and recommended specs for the games that cause the buzzing, and I had the same problem on my old computer, which was also above recommended specs. Is my onboard sound trying to play some of the game's audio? Or is it just some weird error I have to deal with?

 

[ArrowMan]

Check to see if your hard drive is mounted securely. Your hard drive will be under increased load when first loading games.

 

[jds63]

Separate Video card ? Check, could be the fans. Could be other fans inside case. Either bad fan or something got stuck inside it, possibly.