HP Z4 Maintenance and Service Guide - Page 83

Beep error code sequences occur for the, second pause occurs after the last minor blink.

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● 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, '3.5' indicates 3 long red blinks and 5 short white blinks to communicate the processor is not detected. Category BIOS Hardware Major/minor code 2.2 2.3 2.4 3.2 3.3 3.4 Description The main area (DXE) of BIOS has become corrupted and there is no recovery binary image available. The embedded controller policy requires the user to enter a key sequence. The embedded controller is checking or recovering the boot block. The embedded controller has timed out waiting for BIOS to return from memory initialization. The embedded controller has timed out waiting for BIOS to return from graphics initialization. The system board displays a power failure (crowbar).* Interpreting system validation diagnostic front panel LEDs and audible codes 75

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●
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
Error category
1
Not used
2
BIOS
3
Hardware
4
Thermal
5
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, ‘3.5’ indicates 3 long red blinks and 5 short white blinks
to communicate the processor is not detected.
Category
Major/minor code
Description
BIOS
2.2
The main area (DXE) of BIOS has become corrupted and there is no recovery
binary image available.
2.3
The embedded controller policy requires the user to enter a key sequence.
2.4
The embedded controller is checking or recovering the boot block.
Hardware
3.2
The embedded controller has timed out waiting for BIOS to return from
memory initialization.
3.3
The embedded controller has timed out waiting for BIOS to return from
graphics initialization.
3.4
The system board displays a power failure (crowbar).*
Interpreting system validation diagnostic front panel LEDs and audible codes
75