"Brian Gaff" wrote in message
m
Its independent of volume and on headphones. Yes, its
general whining stuff, and does change with processor
load, and drive access as far as I can hear. I have moved
some leads about and its less now, but still audible.
Obviously the psu is a heap of junk. If I could see I'd
go in and put capacitors all over the place!

I agree that the PSU seems to be behaving very poorly. Probably something
wrong with how it is grounded externally, or the layout of the board(s)
inside.

Bypassing the various lead pairs might help. Or, there might be some
place(s) where two grounds were doubled up on 1 wire.

Also check the connectors. Some have 2 or more ground wires (usually black).
One or more might not be making a good connection. Molex connectors of that
era are not so hot.