Editing Sad Mac Error Codes (section)

== Deliberately Triggering a Sad Mac ==

A Sad Mac can be generated on purpose for testing the display path or capturing a screenshot:

* Press the Programmer's Switch (NMI button) before the Happy Mac appears. This produces a Sad Mac with subcode '''000D''' ("NMI — normal indication"). On machines without a fitted programmer's switch (most never had one installed by default), {{code|Cmd-Power}} shortly after the startup chime produces the same effect.
* On the PowerBook 540c and several other PowerBooks, {{code|Cmd-Power}} pressed before the boot screen plays the Chimes of Death (sometimes at a strange speed) without drawing a Sad Mac.

These are not failure indications and should not be confused with a real diagnostic event.