I have an Asus A8n32-SLI Deluxe, and the speskers constantly make a ZZZzZzzZZZZ buzzing noise, like its interfearance, you can hear like a squeel eveythime i move the mouse as well, and its getting right on my ****. I took the machine to work, and it does exactly the same there, so it can't be the speakers, and it aint near anything to give interfearance?? What can it be, any ideas lads?
i used to have the exact same probs, i tried everything to fix it, i went and bought a audigy2 zs last week and now i have perfect sound and its really a lot better quality, more than i expected at least 
Looks like i'll have to get a X-Fi and see if if solves me probs, cheers for the info mate 