hp-support-head-portlet

Actions
Loading...
HP Customer Support - Knowledge Base

hp-contact-secondary-navigation-portlet

Actions
Loading...

hp-share-print-widget-portlet

Actions
Loading...
  • Information
    Learn how to upgrade to Windows 11

    Windows 11 Upgrade Guide

    Information
    Need help with HP Instant Ink?

    Find solutions and helpful tips on our Instant Ink Support page. Get Instant Ink Support

  • Feedback

hp-concentra-wrapper-portlet

Actions
Loading...

HP Z400/Z600/Z800 Workstation - Diagnostic LED Codes

Environment

HP Z400 Workstation
HP Z600 Workstation
HP Z800 Workstation

Questions/Symptoms

Power-On Self-Test (POST) fails
Beeps
LED codes (Diagnostic Codes)

Cause

Answer/Solution

Use the Diagnostic LED Code and Beep Code to isolate the failure.

NOTE: Workstation beeps are emitted from the chassis speaker. The flashing lights and beeps repeat for five cycles. After five cycles, only the flashing lights repeat.

The Diagnostic LED blinks red 2 times and the system beeps 2 times (once per second), then a 2–second pause follows:

This indicates that a thermal shutdown has occurred.

To resolve the issue, complete the following steps:

1) Ensure that the workstation air vents are not blocked.

2) Open the access panel, and press the workstation power button.

3) Verify that the system fan is running.

4) Verify that the processor heat sink fan spins. If it does not spin, ensure that the fan cable is plugged into the system board connector. Ensure that the heat sink is properly seated.

5) Replace the processor heat sink.

The Diagnostic LED blinks red 3 times and the system beeps 3 times (once per second), then a 2-second pause follows:

This indicates that the processor is not installed.

To resolve the issue, complete the following steps:

1) Install the processor.

2) Reseat the processor.

3) If the issue persists, replace the processor.

The Diagnostic LED blinks red 4 times and the system beeps 4 times (once per second), then a 2-second pause follows:

This indicates power failure.

To resolve the issue, complete the following steps:

1) Open the access panel, and ensure that the necessary power supply cables are connected to the system board.

2) Locate a faulty device by removing all devices, and then reinstalling one at a time until the workstation fails:

- Disconnect AC power to the workstation.
- Remove all the devices.
- Reinstall a device.
- Reconnect AC power.
- Continue adding devices to ensure that all devices are functioning properly.
- Replace the device causing the failure.

3) Verify the power supply functionality.

- Disconnect AC power.
- Z400: Remove all internal power supply cables from the system board.
- Z600 & Z800: Remove the Power Supply from the chassis
- Plug in AC power.

If the power supply fan spins, and the LED illuminates, then the power supply is good. Replace the system board.
If the power supply fan does not spin, or the LED does not illuminate, then replace the power supply.

The Diagnostic LED blinks red 5 times and the system beeps 5 times (once per second), then a 2-second pause follows:

This indicates a pre-video memory error.

To resolve the issue, complete the following steps:

1) Ensure that the memory modules are loaded correctly.

2) Reseat the memory modules.

3) Replace the memory modules one at a time to find the faulty module.

4) Replace the third-party modules with HP memory.

5) Replace the system board.

The Diagnostic LED blinks red 6 times and the system beeps 6 times (once per second), then a 2-second pause follows:

This indicates a pre-video graphic card error.

To resolve the issue, complete the following steps:

1) Reseat the graphics card.

2) Replace the graphic card.

3) Replace the system board.

The Diagnostic LED blinks red 7 times and the system beeps 7 times (once per second), then a 2-second pause follows:

This indicates system board failure (ROM detected a failure before video).

To resolve the issue, complete the following steps:

1) Re-flash the ROM.

2) Replace the system board.

The Diagnostic LED blinks red 8 times and the system beeps 8 times (once per second), then a 2-second pause follows:

This indicates an invalid system ROM based on bad checksum and entering Failsafe (Boot Block) recovery mode.

To resolve the issue, complete the following steps:

1) Re-flash the system ROM. (Failsafe Boot Block ROM Recovery)

2) Replace the system board.

The Diagnostic LED blinks red 9 times and the system beeps 9 times (once per second), then a 2-second pause follows:

This indicates that the system is turned on, but is unable to boot.

To resolve the issue, complete the following steps:

1) Replace the system board.

2) Replace the processor.

hp-feedback-input-portlet

Actions
Loading...

hp-feedback-banner-portlet

Actions
Loading...

hp-country-locator-portlet

Actions
Loading...
Country/Region: Flag Ireland

hp-detect-load-my-device-portlet

Actions
Loading...