"Brian Gaff" wrote in message
om

I had to put a new psu in a machine over the Christmas,
and now notice the bog standard Soundblaster live card
seems to be outputting a kind of gurgling whine which
varies and kind of sounds likt e sort of low level

Two probable causes:

(1) Bad grounding of the buses on the system board.

(2) Bus domination. You need to follow up and find out what is changing that
correlates with the noise. One possible such source would be the hard drive
or the mouse. Problems that track the mouse trace back to the video card.
Problems with bus domination by hard drive controllers and video cards can
sometimes be addressed via BIOS and driver parameters.

If grounding is the problem, then there is a possibility that floating the
analog audio output of the audio interface might help. To evaluate this see
how the card sounds with just headphones plugged into it.