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From: thomas@eleazar.dartmouth.edu (Thomas Summerall)
Newsgroups: comp.sys.mac
Subject: HELP!  My Mac II is freaking out!
Message-ID: <16908@dartvax.Dartmouth.EDU>
Date: 14 Nov 89 16:13:08 GMT
Sender: news@dartvax.Dartmouth.EDU
Reply-To: thomas@eleazar.dartmouth.edu (Thomas Summerall)
Organization: Dartmouth College, Hanover, NH
Lines: 24

My System:  Mac II, Apple HD40 internal, 5 megs
            Apple 8 bit video card, Apple RGB Monitor
            68851RC16A PMMU
            Orchid Macsprint Cache Card
              -Four megs, the PMMU, and the Macsprint, and the motherboard
               are recently installed, the problems began since their instal-
               lation, but not immediately after.

The Problem: At random intervals, sometimes within minutes of startup, sometimes
    after a couple of hours (usually the former) the screen flashes with static.
    The flashes tend to worsen over time until they are several seconds long.
    They resemble snow on a tv screen.  Only after ten or fifteen of these
    errors does it cause a system crash.  Sometimes these crashes are so hard
    that the screen remains dark after resetting and I have to manually power
    down.  I have no clue as to where these strobes are coming from.  They
    don't seem to be scrambling the RAM because only the most severe actually
    cause errors.  I don't have an anti static pad so I haven't tried to
    unplug the MacSprint.  I have turned it off with software, and the problems
    still occur.  Same with all inits off.  It also happens in any program.

HELP!  Thanks in advance,

Thomas Summerall
thomas@eleazar.dartmouth.edu