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From: rc3h+@andrew.cmu.edu (Ross Ward Comer)
Newsgroups: comp.sys.mac.hardware
Subject: Multifinder Makes my SE/30 Whine
Message-ID: <0ZqAx6W00WB_AjR0MB@andrew.cmu.edu>
Date: 14 Feb 90 03:23:50 GMT
Organization: Class of '91, Carnegie Mellon, Pittsburgh, PA
Lines: 31

Yes, whine.  As in a high pitched noise.  Audible just enough to be
annoying.

Symptoms:
Occurs only under Multifinder, not finder.
Occurs on a new SE/30 (with Apple's hard-drive 'fix' (ha-ha))
Occurs only when >1 Meg RAM installed
     (ie doesn't happen with 1 Meg, does with 2M, 4M, 5M, etc)
Occurs whenever system is idle (waiting for user input)
Stops whenever their is much system activity
     (ie heavy computations/programs running)
Stops on any user input (ie holding the mouse button down stops it)


My thoughts:
Power supply.  Heavy computations or user input (downclick) increase
power demand which increases frequency to inaudible or
non-vibrational.

I don't think it's the 40M hard drive.  Downclicks and heavy (internal
memory) computations wouldn't change anything with the drive.

What stumps me is that it only happens under Multifinder and not
Finder, and it only occurs when >1Meg RAM installed (stopping on
downclicks is a little funny too in my opinion).

Any suggestions/thoughts would be much appreciated.

ross
rc3h@andrew.cmu.edu
Carnegie Mellon University