Path: utzoo!attcan!uunet!zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!ames!dftsrv!mimsy!mojo!russotto
From: russotto@eng.umd.edu (Matthew T. Russotto)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Mac SE Startup Error
Keywords: Mac SE RAM Error Help
Message-ID: <1991Jan28.054033.864@eng.umd.edu>
Date: 28 Jan 91 05:40:33 GMT
References: <5712@idunno.Princeton.EDU>
Sender: news@eng.umd.edu (C-News)
Organization: College of Engineering, Maryversity of Uniland, College Park
Lines: 25

In article <5712@idunno.Princeton.EDU> johnm@phoenix.Princeton.EDU writes:
>*** Description of the problem: ***
>
>- I turn on the power to the computer, and hear the normal startup beep sound
>for the SE.
>
>- Immediately the screen comes up with a black-and-white checkerboard pattern.
>At no time does the normal medium-gray screen appear. The checkerboard display
>is composed of 1 cm by 3 cm rectangles, alternating either black or white, that
>fill the entire screen. 
>
>- The SE had a resistor clipped to allow it to access the 4Mb of upgraded RAM.
>(As one of the original run of SEs, this machine has a resistor rather than a
>jumper that required clipping to increase RAM.) Now of course it is back to
>4x256Kb SIMMs or 1Mb of RAM.
>     Could the clipped resistor be responsible for the bizzare startup error?
>The screen seems to show up so immediately upon startup that its seems unlikely
>the memory was actually being checked before the error occurs. 

This is it-- the Mac thinks the screen is at one location, when it is actually
at another (no, I don't know why the happy mac shows up in both locations,
but it always does)
--
Matthew T. Russotto	russotto@eng.umd.edu	russotto@wam.umd.edu
     .sig under construction, like the rest of this campus.