Maddening buzzing/humming when computer is idle

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Hi everyone thanks in advance for any help,

I'm getting a constant humming/buzzing sound that is driving me nuts. The noise only comes through when no other sounds are being played. For example, music, games, Ventrilo activity will all mask the noise. (I'm not sure if it completely cancels the noise or is just loud enough to cover it up...) But if I am browsing the web or typing a document with no background audio the buzzing is always there.

Here's my setup:

-Logitech headphones (used these for over 4 years with no issue...)
-Plugged into Gigabyte GA-EX58-UD3R LGA 1366 Intel X58 ATX Intel mobo audio jack [Realtek HD Audio Manager]
-CoolerMaster Cosmos case

I don't think any other hardware would be of relevance, but tell me if otherwise.

I built my rig in July and this issue has only crept up in recent weeks - please help before this sound drives me nuts!
 
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