Apple told to me keep the sound-check box checked (with a different problem, though).
So I don't know if that will help.
pendragon,
I think the guy in the discussion at Apple has the same problem I had with my PM G4 early this year. It was a hardware problem (my G4's motherboard was replaced).
Jay,
just to make sure, (although I am sure you already did that ) did you try to set the volume in iTunes to the max (not the system volume)?
[ 05-01-2003, 11:58 AM: Message edited by: Spartacus ]