Issue with line out on Gygabyte GA-Z68X-UD3H-B3

Hello,

I recently upgrated my system with a Gygabyte GA-Z68X-UD3H-B3 motherboard and Corsair 500R case, but now when I plug my amplified into the line out jack on the board (green jack), there is a mild hum sound. This didn't exist with the old system, so it's definitely a result of going to this new motherboard and case. Could it be that the MB isn't properly grounded to the power supply ground?
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