Model M0001 Sad Error Code 042001

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Macintosh Classic

The Macintosh Classic was a personal computer produced by Apple Computer, Inc. between 1990 and 1992. Model numbers: M0420 and M1420

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Chris Schruckmayr @chrisschru61832

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Posted: Aug 2, 2023

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Model M0001 Sad Error Code 042001

Code 042001 populates on screen upon flipping power switch on and appears directly after power on chime. Anybody know what this error represents and how to fix it? I bought the computer at a yard sale recently…

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DarkSould04 @darksould04 Rep: 1 1 · Answer 1 · 2026-09-19T06:00:23-07:00

DarkSould04 @darksould04

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Posted: Sep 19, 2026

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Old question i know. It is a RAM related code, try re-seating the ram expansion or look at the motherboard for cracked solder joints near the built in RAM.

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Macintosh Classic

Model M0001 Sad Error Code 042001

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