Interpreting System Validation Diagnostic Front Panel Leds And Audible Codes - HP Z4 G4 Maintenance And Service Manual

Table of Contents

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:

●

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

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.