EMI interference on sound card?

[will]

Hi all,
I have recently noticed I am getting some kind of interference affecting my audigy 2zs sound card. I think it's interference, it sort of buzzes (through the speakers, not the actual card) when you move the mouse, like when you're using crappy onboard sound. It still does it when the volume is turned down all the way to 0 in windows. It can be reduced a bit by turning the volume up in windows and down on the speakers, as the volume of the buzzing remains constant regardless of windows volume level, but obviously is amplified when the speaker volume is turned up. Is this EMI? And why has it only started doing it now?

 

[AddSub]

It only happens when you move the mouse, or is the buzz constant regardless? Is your mouse wireless? Do you have your case cover on?

 

[Homeless]

try switching your OCZ Modxstream 900W with your Antec NeoHE 550W and post results back

 

[will]

There is a slight constant noise, but it gets much louder and changes pitch when I move the mouse. I'll try changing the PSUs around tomorrow, do you think the supply current is slightly dodgy?

 

[AddSub]

There is a slight constant noise, but it gets much louder and changes pitch when I move the mouse.

Definitive interference coming from somewhere then. If you have a power supply tester on hand or even a cheapo multimeter you can test your power supply yourself. That's what I do if I suspect there is anything wrong PSU-wise.

Noise could be coming from anywhere and anything. When it comes to a regular desktop PC there a hundred things inside and outside of it that could cause something like that. High OC, overheating sound IC or south bridge if that's where the sound codec is located. A wireless mouse with a sub-standard radio transmitter can wreak havoc. Shoddy indoor wiring can do this was well. Did you try different speakers or headphones? If not, I would give that a shot as well.