Speaker Hum from gigabyte 965p

[captainfreedom]

I bought a gigabyte 965p ds4 reciently and I notice a hum when you connect the speakers. I had the same speakers on my old pc and there was no hum.
Anyone know what's the problem?

[IAmATeaf]

Humming is normally caused by an earthing problem but I've no idea how to fix it though.