![]() It appears silently with no audible tone, while displaying a hexadecimal error code on a single line. On older 68k compact Macs, from the Macintosh 128K to the Plus, the Sad Mac has a checkerboard pattern around the icon, making it appear to be within a 32x32 gray square while on a black background. ![]() The codes that appear with the Sad Mac screen can represent different information on different Macintosh models. ![]() Īn older code indicating a ROM checksum error on a Mac Plus. HistoryĪccording to pre-release screenshots of the Macintosh system software taken by Bill Atkinson during early development, the Sad Mac icon had used a working title of "sick mac". A Sad Mac may be deliberately generated at startup by pressing the interrupt switch on Macs that had one installed, or by pressing the Command and Power keys immediately after the startup chime. A Sad Mac that only appears upon loading from a specific startup disk indicates a problem with the system software on that disk that is making it unbootable. A Sad Mac that appears immediately upon turning on a Macintosh, before the system software has loaded, indicates a problem with the hardware or firmware.
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