My 4000/200 does not whine.  Possibly you may
have some fan problems?  I have several suns
that developed whines (VME crates with lots of
fans).  The cure was to gently open up the fan
bearing by poking a tiny hole in the cover label
and injecting some WD40 or lube of some sort.
Does the whine sound like motor bearings or like
a digital noise of some sort?

Bob