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From: ooblick@eddie.MIT.EDU (Mikki Barry)
Newsgroups: comp.sys.mac
Subject: Re: Still sick Mac
Message-ID: <5978@eddie.MIT.EDU>
Date: Sun, 31-May-87 16:33:39 EDT
Article-I.D.: eddie.5978
Posted: Sun May 31 16:33:39 1987
Date-Received: Tue, 2-Jun-87 02:25:46 EDT
References: <10129@decwrl.DEC.COM>
Reply-To: ooblick@eddie.MIT.EDU (Mikki Barry)
Organization: MIT, EE/CS Computer Facilities, Cambridge, MA
Lines: 22

In article <10129@decwrl.DEC.COM> mason@furilo.dec.com (Explaining is not understanding) writes:
>HELP!  I now have: 512Ke with 2MB MacMemory upgrade and MacBottom 20 serial
>HD.  The upgrade was a logic board swap.  The new(?) board has a long diagonal
>jumper on the underside (interesting?).

The problems you described happened to me as well with a MacMemory upgrade.
Although the memory itself is fine, you will find that the voltage from
the power supply will be continually declining, finally to the point where
the "machine gun noises" and blank screen appear.  If you take the machine
to your local dealer, you will most likely find that the voltage is somewhere
below specs.  

The difference with my problem was that the machine worked fine for 5
months with the upgrade, THEN, all of a sudden, kept flaking out, until
it just wouldn't work anymore.  The dealer tried changing the power supply,
which worked for about a day, then took out the board.  Voila, worked fine.
They sent the board back under warranty, but I don't know if I want the damn
thing back.

Mikki Barry
____________________
"I want my goddamn Mac II and I want it NOW!!!"