HP ZBook Studio G3 Maintenance and Service Guide - Page 87
Interpreting system validation diagnostic front panel LEDs and audible codes
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Interpreting system validation diagnostic front panel LEDs and audible codes During the system validation phase that occurs at system startup, the BIOS validates the functionality of the following subsystems and conditions: ● AC adapter ● System board power ● Processor failure ● BIOS corruption ● Memory failure ● Graphics failure ● System board failure ● BIOS authentication failure If an error is detected, specific patterns of long and short blinks, accompanied by long and short beeps (where applicable) are used to identify the error. These patterns will make up a two part code: ● Major - the category of the error ● Minor - the specific error within the category NOTE: Single beep/blink codes are not used. Number of long beeps/blinks 1 2 3 4 5 Error category Not used BIOS Hardware Thermal System board Patterns of blink/beep codes are determined by using the following parameters: ● 1 second pause occurs after the last major blink. ● 2 second pause occurs after the last minor blink. ● Beep error code sequences occur for the first 5 iterations of the pattern and then stop. ● Blink error code sequences continue until the computer is unplugged or the power button is pressed. NOTE: Not all diagnostic lights and audible codes are available on all models. The red LED blinks to represent the major error category (long blinks). The white LED blinks to represent the minor error category (short blinks). For example, '2.3' indicates 2 long red blinks and 3 short white blinks to communicate the processor is not detected. CAP/NUM Blink = 2 indicates CAP/NUM will blink 2 cycles, each cycle has one 2.3 sequence. General troubleshooting steps 73