I am having an EMI issue with my computer for the past 6 months, it has been escalating ever since and I've went through many attempts to clear it. Heres what I can tell you: -It doesn't matter which outlet I plug in to. -The speakers work perfectly when the computer is turned off or in use with another device. -I have an EMI filter on the outlet. -Headphones work with a faint scratching noise. Can hear HDD rotations, CPU activity, mouse movement, like telepathy to computers. I'm beginning to wonder if it's the power supply, as I have swapped sound cards three times in this computer's lifetime and my PSU has mixed reviews. It's a Cooler Master GX750. My motherboard has worked perfectly since the day I bought it. Help? Please?