G5-Digi 002 Desk Computer noise?????????

[HODGEKINS]

Hi,
I was wondering if anyone could please help me. I am running pro tools L.E on a G5 twin 2ghz processors with a digi 002 desk. I have a Focusrite voice master pro (hardware vale box basicly). If i record straight through the focusrite into the back of the 002 there is no noise problems and its fine however i want to send out pre recorded audio out of the 002 through the focusrite and back into the 002, now when i do this there is a (electonical?) noise, this noise is always there being picked up by my monitor speakers but does not effect normal audio recording but when i come out of the 002 the focusrite is amplifiying the noise making me unable to use it. I have made sure that each unit only has one earth source so im pretty sure that its not an earth loop. If i wiggle my mouse the noise cooporates so im almost certain that its a computer noise. Nobody i talk to can help so if there is anyone outhere with any clues they would be amazing. cheers Rich.

[Mixchump]

You might want to check with apple regarding G5 noise issues. I remember some people complaining about noise on the built-in S/PDIF outputs. And I do remember it being related to USB activity, etc... Definitely check with the Apple support forums about it though...
Cheers!

[albee1952]

Just read the post and have to ask, what are you trying to accomplish by sending tracks out and back in thru the preamp? There are some good reasons not to do that. Just curious