G5 In-built Audio Distortion, Card trouble? Options

[bimmberly]

Hello
My G5 2 gig duel is making lots of distortion when i turn up the volume on my mixing desk, even more so when i move the mouse around and select the dock to pop out on the screen. It sounds like processor noise or some kind of internal interference.
I'm using the in-built audio going straight into the mixer.
I just got it back from the repairers today(to be repaired for the same problem), they put in a new power supply but it has not worked. (i didnt pay for it)

Has anyone had the same problem or any idea of what it could be?

Please help
Thanks

[thumprchgo]

The G5 power supply is at fault, my G5 DP had the same problem. See discussions at http://www.thinksecret.com/news/g5noise.html and an Apple technote: http://docs.info.apple.com/article.html?artnum=86655

I solved my buzzy audio problem (moving windows on the desktop was "audible") by getting a ground loop isolator, about 16 dollars US at Radio Shack. The technote above has info on it....