7.2 About Power-On Self-Test (POST) Diagnostics
The POST diagnostic code resides in flash PROM on the main logic board. The flash PROM that holds the POST code is known as the OpenBoot PROM (OBP) because it also holds the OpenBoot Diagnostic code.
POST tests the following system components each time the system is turned on or a system reset is issued:
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CPU modules
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Memory modules
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NVRAM
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Main logic board
POST reports its test results by flashing or steadily illuminating LEDs on the system's front panel. If a keyboard is installed, POST also displays test results on the keyboard LEDs. See "7.12.1 Error Indications" for more information about LEDs and error messages.
POST displays detailed diagnostic and error messages on a local terminal, if one is attached to the system's serial port A. For information about running POST, see "7.3 How to Use POST Diagnostics".
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