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HP Desktop PCs - Computer Does Not Start and Emits an LED or Beep Code

One of the first things a computer does when it turns on is run a hardware test to make sure everything is working correctly. If your desktop finds an error, it might not start and the light emitting diodes (LEDs) blink or the computer emits an audible beep.

Perform a power reset of your computer

Perform a power reset (or hard reset) to clear information from the computer's memory without erasing personal data.

Power reset your desktop computer

Perform a power reset on your desktop computer.

  1. Turn off the computer.

  2. Disconnect any peripheral devices, and then unplug the power cord.

  3. With the power cord unplugged, press and hold the Power button for approximately 15 seconds.

  4. After you drain the capacitors, plug in the power cord. Leave peripheral devices disconnected.

  5. Turn on the computer.

Identify the desktop LED or beep code

Specific patterns of long and short light emitting diode (LED) blinks, or audible short beeps can help identify a variety of issues.

Note:

Diagnostic lights and audible beep codes are not available on all models.

Review the following to reference the LED blink or computer beep sequence.

  • The red LED blinks represent a major error category (long blinks).

  • The white LED blinks represent a minor error category (short blinks).

  • A one (1) second pause occurs after the last major blink.

  • A two (2) second pause occurs after the last minor blink.

  • Blink error code sequences continue until you unplug the computer or press the power button.

  • Beep error code sequences occur for the first five (5) iterations of the pattern, and then stop.

The red light blinks twice, and then two, short white light blinks

This condition indicates the main area (DXE) of the BIOS has become corrupted and no recovery binary image is available. It can also occur when updating the BIOS.

  1. Allow the system to complete its updates and any changes.

  2. Attempt Sure Start Recovery if the updates are not installing as expected.

The red light blinks twice, and then three, short white light blinks

This condition indicates the embedded controller policy requires you to type a key sequence.

  1. Follow any prompts.

  2. Attempt Sure Start Recovery if the issue persists.

The red light blinks twice, and then four, short white light blinks

This condition indicates the embedded controller is checking or recovering the boot block.

  1. Allow the system to attempt to recover the BIOS.

  2. Attempt Sure Start Recovery if the issue persists after waiting several minutes.

The red light blinks three times, and then two, short white light blinks

This condition indicates a potential memory failure.

Test computer memory

Use the BIOS Setup Utility to perform a memory self-test.

  1. Make sure the power cord is plugged in the computer.

  2. Turn off the computer, but leave the power cord plugged in.

  3. Turn on the computer, and then immediately press the F10 key repeatedly until the BIOS Setup menu opens.

  4. In the BIOS Setup Utility, use the arrow keys to select Diagnostics, and then select Memory Test.

  5. Press Enter, and then select Yes.

  6. Wait for the test to complete.

  7. After the test completes, note the results, and then press F10 to Save and Exit.

  8. Press Enter to Exit Saving Changes.

Reseat the memory module

Reseat the memory module from inside the computer.

CAUTION:

This product contains components that can be damaged by electrostatic discharge (ESD). HP recommends using an anti-static wrist strap and working over a non-carpeted floor with a conductive foam pad to reduce the to reduce the chance of electrostatic discharge (ESD) damage.

  1. Turn off the computer, and then disconnect the power cord and any cables.

  2. Remove the side access panel.

    Removing the side access panel on a desktop computer
  3. Locate the memory module.

    To find the location of the memory module, go to HP Customer Support, and then open the Maintenance and Service Guide for installed memory information for your computer.

  4. Ground yourself to discharge any static electricity by placing one hand on the case of the computer, and then touch the other hand to a metal surface or grounded object, such as the metal part of a lamp.

  5. Reseat the memory modules in the computer, aligning the notches on the modules with the tabs in the memory slot. Press down on the memory module to secure the it in place.

  6. Replace the side access panel, and then plug in power cord.

  7. Turn on the computer.

  8. Confirm that the computer can start up and run in the Windows operating system.

    Contact HP Customer Support if the computer does not start into Windows.

Replace the affected component

Replace the affected part or component if the issue persists after completing all the preceding steps.

Contact HP Customer Support to schedule a product repair or replacement. If you are in Asia Pacific, you are directed to a local service center in your area.

To confirm your warranty status, go to HP Product Warranty Check. Repair fees might apply for out-of-warranty products.

The red light blinks three times, and then three, short white light blinks

This condition indicates a potential graphic chip failure.

Contact HP Customer Support for further assistance.

The red light blinks three times, and then four, short white light blinks

This condition indicates a potential power system failure.

  1. Reduce to minimum configuration (CPU, System board, PSU, 1 DIMM of memory), and then isolate the failed component.

  2. Reduce further if issue persists.

  3. Test your system with a known good PSU.

  4. Contact HP Customer Support for further assistance to replace the component, system board, processor (CPU), or PSU if the issue persists.

The red light blinks three times, and then five, short white light blinks

This condition indicates that computer does not detect the processor (CPU).

Contact HP Customer Support for repair due to system board or CPU failure.

The red light blinks three times, and then six, short white light blinks

This condition indicates the processor does not support an enabled feature.

Find the product number on your desktop

Find your product name, number, and serial number on the computer or on the box it shipped in.

  • On the side of the case

    Locating the product label on the side of the case
  • On the top or rear of the case

    Locating the product label on the top and rear of the case
  • On the front or side of the case

    Locating the product label on the front and side of the case
  • On the box the computer shipped in

    Locating the product label

Reset the CMOS

Reset Complementary Metal Oxide Semiconductor (CMOS) data for your computer.

CAUTION:

This product contains components that can be damaged by electrostatic discharge (ESD). HP recommends using an anti-static wrist strap and working over a non-carpeted floor with a conductive foam pad to reduce the to reduce the chance of electrostatic discharge (ESD) damage.

  1. Turn off your computer, and then disconnect the power cord and any cables from the computer.

  2. Make sure you have the model number for your computer, go to HP Customer Support, and then navigate to the product page for your computer.

  3. Open the specifications document or service guide for motherboard information, and then locate the steps for resetting the CMOS.

    The steps for resetting the CMOS might named Clearing CMOS or similar.

    • If the guide lists steps to reset the CMOS: Follow the instructions.

    • If the guide does not list steps to reset the CMOS: Continue with these steps.

  4. With the computer turned off, press the Power button ten (10) times to fully discharge electricity form the system.

  5. Ground yourself to discharge any static electricity by placing one hand on the case of the computer, and then touch the other hand to a metal surface or grounded object, such as the metal part of a lamp.

  6. Open the computer to access to the motherboard.

  7. Remove or disconnect the CMOS battery from the motherboard.

    Example of different CMOS battery types
  8. Confirm all sources of electricity are removed or disconnected from the computer, including the CMOS battery.

  9. Press the Power button for a minimum of 60 seconds to drain all power from the computer and reset the CMOS values on the motherboard.

  10. Reconnect or reinstall the CMOS battery, and then close the computer.

  11. Plug in the power cord to the desktop, and then turn on the computer.

    A message displays confirming the CMOS reset. The message varies by model.

    Example message that displays to indicate the CMOS reset
  12. Confirm the Time in BIOS is set to 00:00.

    If not, repeat the steps to reset the CMOS, but press and hold the Power button for 120 seconds when draining all the power from the computer.

Replace the affected component

Replace the affected part or component if the issue persists after completing all the preceding steps.

Contact HP Customer Support to schedule a product repair or replacement. If you are in Asia Pacific, you are directed to a local service center in your area.

To confirm your warranty status, go to HP Product Warranty Check. Repair fees might apply for out-of-warranty products.

The red light blinks four times, and then two, short white light blinks

This condition indicates the processor (CPU) might be overheating.

Confirm the fans work correctly

Inspect the fans inside the computer to make sure they are working as expected.

CAUTION:

If a fan is not working correctly, stop using the computer. Exposure to consistently high temperatures can damage internal parts.

  1. Turn on the computer.

  2. Locate the fans inside the case. Locations vary by computer model.

    CAUTION:

    You can use a flashlight to help you locate each fan, but avoid using the flashlight inside the computer to prevent damaging internal parts.

    Locating fans for HP Desktop and Slimline computers

    Fan Type

    1.

    Power supply fan

    2.

    Graphics card fan

    3.

    Processor fan

    4.

    Power supply fan vent

    5.

    Case fan vent

    6.

    Case fan

  3. Note any fans that might be not be working or are making loud, growling noises.

Clean the desktop air vents

Clean the desktop air vents to remove any dust or debris that might have accumulated in and around the air vents over time, obstructing the airflow and causing the fans to work harder than normal to remove the heat.

  1. Turn off the computer, disconnect the power cord and cables, and then wait for the computer to cool down.

  2. Use a vacuum to clean all exterior vents, especially around the power supply vent.

    CAUTION:

    To avoid damaging internal components, do not use the vacuum inside the computer.

    Locating the air vents on the rear of the computer
  3. Remove the side panel back from the computer.

    Removing the side panel from a desktop computer
  4. Use canned air to clean the fans and components inside the computer.

  5. Replace the side panel, reconnect the power cord, and then turn on the computer.

Find the product number on your desktop

Find your product name, number, and serial number on the computer or on the box it shipped in.

  • On the side of the case

    Locating the product label on the side of the case
  • On the top or rear of the case

    Locating the product label on the top and rear of the case
  • On the front or side of the case

    Locating the product label on the front and side of the case
  • On the box the computer shipped in

    Locating the product label

Reset the CMOS

Reset Complementary Metal Oxide Semiconductor (CMOS) data for your computer.

CAUTION:

This product contains components that can be damaged by electrostatic discharge (ESD). HP recommends using an anti-static wrist strap and working over a non-carpeted floor with a conductive foam pad to reduce the to reduce the chance of electrostatic discharge (ESD) damage.

  1. Turn off your computer, and then disconnect the power cord and any cables from the computer.

  2. Make sure you have the model number for your computer, go to HP Customer Support, and then navigate to the product page for your computer.

  3. Open the specifications document or service guide for motherboard information, and then locate the steps for resetting the CMOS.

    The steps for resetting the CMOS might named Clearing CMOS or similar.

    • If the guide lists steps to reset the CMOS: Follow the instructions.

    • If the guide does not list steps to reset the CMOS: Continue with these steps.

  4. With the computer turned off, press the Power button ten (10) times to fully discharge electricity form the system.

  5. Ground yourself to discharge any static electricity by placing one hand on the case of the computer, and then touch the other hand to a metal surface or grounded object, such as the metal part of a lamp.

  6. Open the computer to access to the motherboard.

  7. Remove or disconnect the CMOS battery from the motherboard.

    Example of different CMOS battery types
  8. Confirm all sources of electricity are removed or disconnected from the computer, including the CMOS battery.

  9. Press the Power button for a minimum of 60 seconds to drain all power from the computer and reset the CMOS values on the motherboard.

  10. Reconnect or reinstall the CMOS battery, and then close the computer.

  11. Plug in the power cord to the desktop, and then turn on the computer.

    A message displays confirming the CMOS reset. The message varies by model.

    Example message that displays to indicate the CMOS reset
  12. Confirm the Time in BIOS is set to 00:00.

    If not, repeat the steps to reset the CMOS, but press and hold the Power button for 120 seconds when draining all the power from the computer.

Prepare for replacing parts of the computer

Prepare for replacing a part of the computer by making sure your computer, components, and workspace are ready.

  1. Turn off the computer, and then wait for components to cool.

  2. Disconnect the power cord and any cables from the computer, and then unplug the power cord from the wall outlet, surge protector, extension cable, or power strip.

  3. Transfer the computer to a clear, flat, stable work surface over a non-carpeted floor with a conductive foam pad to reduce the chance of electrostatic discharge (ESD) damage. HP recommends using anti-static wrist straps.

  4. Keep and parts or components in their protective packaging until you are ready to install them.

  5. Make sure you have a Phillips or Flathead screwdriver, depending on your computer model.

Replace the thermal paste on the processor

Thermal paste can dry out and crack over time, making the fans inside the computer work harder and putting extra strain on the processor. Replace the thermal paste between the heat sink and processor to help the computer maintain an optimal internal temperature.

  1. Turn off the computer, disconnect the power cord and any cables, and then wait for components to cool.

  2. Gather the following materials:

    • Thermal paste

    • A flathead or TR15 screwdriver

    • Cotton swabs or microfiber cloth

    • An electrostatic discharge (ESD) wrist strap or conductive foam pad for proper grounding

    • Cleaning solution, such as Isopropyl alcohol or thermal compound cleaner

      CAUTION:

      Avoid using standard 70% rubbing alcohol as it can cause corrosion and damage internal parts.

  3. Disconnect the power cord and any cables from the computer

  4. Slide the side panel back and away from the computer, and then set the panel aside.

    Warning:

    The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.

  5. Carefully place the desktop on its side so the motherboard is parallel with the work surface.

  6. Ground yourself to remove any built-up electrostatic discharge (ESD) before reaching inside the computer.

    CAUTION:

    This product contains components that can be damaged by electrostatic discharge (ESD). HP recommends using an anti-static wrist strap and working over a non-carpeted floor with a conductive foam pad to reduce the to reduce the chance of electrostatic discharge (ESD) damage.

  7. Disconnect the processor fan power cable from the motherboard.

    Disconnecting the processor fan power cable from the motherboard
  8. Remove the four screws around the processor fan in a star pattern, instead of clockwise, to avoid putting unnecessary pressure on the motherboard.

    Removing the four screws in a star pattern
  9. Pull the fan up and away from the motherboard, and then set it with the fan facing down on a level surface.

  10. Lightly dampen a cotton swab or microfiber cloth with cleaning solution, such as isopropyl alcohol.

    Lightly dampening a microfiber cloth with cleaning solution
  11. Locate the thermal paste on the processor.

    Locating the thermal paste on the processor

    1.

    Heat sink

    2.

    Processor

  12. Gently clean the surface of the processor until all thermal paste is removed.

    CAUTION:

    Do not remove the processor chip from its socket. There are delicate pins that can be damaged easily.

    Cleaning all the thermal paste from the processor
  13. Clean the surface of the heat sink until all of the thermal paste is removed.

    Cleaning all the thermal paste from the heat sink
  14. Check the heat sink and processor edges for thermal paste, and then clean off any paste found.

  15. Apply a pea-sized amount of thermal paste in the center of the processor.

    Applying a pea-sized amount of thermal paste
  16. Center the heat sink on top of the processor, and then align the screws with the matching holes on the motherboard.

    Centering the heat sink on top of the processor
  17. Secure the screws in a star pattern until there is resistance.

    CAUTION:

    Do not over-tighten the screws. The excess pressure can damage the processor socket and cause the motherboard to crack.

    Securing the heat sink in place
  18. Reconnect the fan power cable into its slot on the motherboard.

  19. Secure the side panel back onto the computer.

  20. Reconnect the power cord, and then turn on the computer.

Replace the affected component

Replace the affected part or component if the issue persists after completing all the preceding steps.

Contact HP Customer Support to schedule a product repair or replacement. If you are in Asia Pacific, you are directed to a local service center in your area.

To confirm your warranty status, go to HP Product Warranty Check. Repair fees might apply for out-of-warranty products.

The red light blinks four times, and then three, short white light blinks

This condition indicates the computer temperature is too high.

Confirm the fans work correctly

Inspect the fans inside the computer to make sure they are working as expected.

CAUTION:

If a fan is not working correctly, stop using the computer. Exposure to consistently high temperatures can damage internal parts.

  1. Turn on the computer.

  2. Locate the fans inside the case. Locations vary by computer model.

    CAUTION:

    You can use a flashlight to help you locate each fan, but avoid using the flashlight inside the computer to prevent damaging internal parts.

    Locating fans for HP Desktop and Slimline computers

    Fan Type

    1.

    Power supply fan

    2.

    Graphics card fan

    3.

    Processor fan

    4.

    Power supply fan vent

    5.

    Case fan vent

    6.

    Case fan

  3. Note any fans that might be not be working or are making loud, growling noises.

Clean the desktop air vents

Clean the desktop air vents to remove any dust or debris that might have accumulated in and around the air vents over time, obstructing the airflow and causing the fans to work harder than normal to remove the heat.

  1. Turn off the computer, disconnect the power cord and cables, and then wait for the computer to cool down.

  2. Use a vacuum to clean all exterior vents, especially around the power supply vent.

    CAUTION:

    To avoid damaging internal components, do not use the vacuum inside the computer.

    Locating the air vents on the rear of the computer
  3. Remove the side panel back from the computer.

    Removing the side panel from a desktop computer
  4. Use canned air to clean the fans and components inside the computer.

  5. Replace the side panel, reconnect the power cord, and then turn on the computer.

Find the product number on your desktop

Find your product name, number, and serial number on the computer or on the box it shipped in.

  • On the side of the case

    Locating the product label on the side of the case
  • On the top or rear of the case

    Locating the product label on the top and rear of the case
  • On the front or side of the case

    Locating the product label on the front and side of the case
  • On the box the computer shipped in

    Locating the product label

Reset the CMOS

Reset Complementary Metal Oxide Semiconductor (CMOS) data for your computer.

CAUTION:

This product contains components that can be damaged by electrostatic discharge (ESD). HP recommends using an anti-static wrist strap and working over a non-carpeted floor with a conductive foam pad to reduce the to reduce the chance of electrostatic discharge (ESD) damage.

  1. Turn off your computer, and then disconnect the power cord and any cables from the computer.

  2. Make sure you have the model number for your computer, go to HP Customer Support, and then navigate to the product page for your computer.

  3. Open the specifications document or service guide for motherboard information, and then locate the steps for resetting the CMOS.

    The steps for resetting the CMOS might named Clearing CMOS or similar.

    • If the guide lists steps to reset the CMOS: Follow the instructions.

    • If the guide does not list steps to reset the CMOS: Continue with these steps.

  4. With the computer turned off, press the Power button ten (10) times to fully discharge electricity form the system.

  5. Ground yourself to discharge any static electricity by placing one hand on the case of the computer, and then touch the other hand to a metal surface or grounded object, such as the metal part of a lamp.

  6. Open the computer to access to the motherboard.

  7. Remove or disconnect the CMOS battery from the motherboard.

    Example of different CMOS battery types
  8. Confirm all sources of electricity are removed or disconnected from the computer, including the CMOS battery.

  9. Press the Power button for a minimum of 60 seconds to drain all power from the computer and reset the CMOS values on the motherboard.

  10. Reconnect or reinstall the CMOS battery, and then close the computer.

  11. Plug in the power cord to the desktop, and then turn on the computer.

    A message displays confirming the CMOS reset. The message varies by model.

    Example message that displays to indicate the CMOS reset
  12. Confirm the Time in BIOS is set to 00:00.

    If not, repeat the steps to reset the CMOS, but press and hold the Power button for 120 seconds when draining all the power from the computer.

Replace the affected component

Replace the affected part or component if the issue persists after completing all the preceding steps.

Contact HP Customer Support to schedule a product repair or replacement. If you are in Asia Pacific, you are directed to a local service center in your area.

To confirm your warranty status, go to HP Product Warranty Check. Repair fees might apply for out-of-warranty products.

The red light blinks four times, and then four, short white light blinks

This condition indicates the MXM graphics card temperature is too high.

Confirm the fans work correctly

Inspect the fans inside the computer to make sure they are working as expected.

CAUTION:

If a fan is not working correctly, stop using the computer. Exposure to consistently high temperatures can damage internal parts.

  1. Turn on the computer.

  2. Locate the fans inside the case. Locations vary by computer model.

    CAUTION:

    You can use a flashlight to help you locate each fan, but avoid using the flashlight inside the computer to prevent damaging internal parts.

    Locating fans for HP Desktop and Slimline computers

    Fan Type

    1.

    Power supply fan

    2.

    Graphics card fan

    3.

    Processor fan

    4.

    Power supply fan vent

    5.

    Case fan vent

    6.

    Case fan

  3. Note any fans that might be not be working or are making loud, growling noises.

Clean the desktop air vents

Clean the desktop air vents to remove any dust or debris that might have accumulated in and around the air vents over time, obstructing the airflow and causing the fans to work harder than normal to remove the heat.

  1. Turn off the computer, disconnect the power cord and cables, and then wait for the computer to cool down.

  2. Use a vacuum to clean all exterior vents, especially around the power supply vent.

    CAUTION:

    To avoid damaging internal components, do not use the vacuum inside the computer.

    Locating the air vents on the rear of the computer
  3. Remove the side panel back from the computer.

    Removing the side panel from a desktop computer
  4. Use canned air to clean the fans and components inside the computer.

  5. Replace the side panel, reconnect the power cord, and then turn on the computer.

Find the product number on your desktop

Find your product name, number, and serial number on the computer or on the box it shipped in.

  • On the side of the case

    Locating the product label on the side of the case
  • On the top or rear of the case

    Locating the product label on the top and rear of the case
  • On the front or side of the case

    Locating the product label on the front and side of the case
  • On the box the computer shipped in

    Locating the product label

Reset the CMOS

Reset Complementary Metal Oxide Semiconductor (CMOS) data for your computer.

CAUTION:

This product contains components that can be damaged by electrostatic discharge (ESD). HP recommends using an anti-static wrist strap and working over a non-carpeted floor with a conductive foam pad to reduce the to reduce the chance of electrostatic discharge (ESD) damage.

  1. Turn off your computer, and then disconnect the power cord and any cables from the computer.

  2. Make sure you have the model number for your computer, go to HP Customer Support, and then navigate to the product page for your computer.

  3. Open the specifications document or service guide for motherboard information, and then locate the steps for resetting the CMOS.

    The steps for resetting the CMOS might named Clearing CMOS or similar.

    • If the guide lists steps to reset the CMOS: Follow the instructions.

    • If the guide does not list steps to reset the CMOS: Continue with these steps.

  4. With the computer turned off, press the Power button ten (10) times to fully discharge electricity form the system.

  5. Ground yourself to discharge any static electricity by placing one hand on the case of the computer, and then touch the other hand to a metal surface or grounded object, such as the metal part of a lamp.

  6. Open the computer to access to the motherboard.

  7. Remove or disconnect the CMOS battery from the motherboard.

    Example of different CMOS battery types
  8. Confirm all sources of electricity are removed or disconnected from the computer, including the CMOS battery.

  9. Press the Power button for a minimum of 60 seconds to drain all power from the computer and reset the CMOS values on the motherboard.

  10. Reconnect or reinstall the CMOS battery, and then close the computer.

  11. Plug in the power cord to the desktop, and then turn on the computer.

    A message displays confirming the CMOS reset. The message varies by model.

    Example message that displays to indicate the CMOS reset
  12. Confirm the Time in BIOS is set to 00:00.

    If not, repeat the steps to reset the CMOS, but press and hold the Power button for 120 seconds when draining all the power from the computer.

Replace the affected component

Replace the affected part or component if the issue persists after completing all the preceding steps.

Contact HP Customer Support to schedule a product repair or replacement. If you are in Asia Pacific, you are directed to a local service center in your area.

To confirm your warranty status, go to HP Product Warranty Check. Repair fees might apply for out-of-warranty products.

The red light blinks five times, and then two, short white light blinks

This condition indicates the embedded controller is missing valid firmware.

Remove recently installed hardware

Remove any recently installed hardware if the computer is not working as expected.

  1. Check your computer for any recently installed hardware.

  2. Remove any recently installed hardware.

Find the product number on your desktop

Find your product name, number, and serial number on the computer or on the box it shipped in.

  • On the side of the case

    Locating the product label on the side of the case
  • On the top or rear of the case

    Locating the product label on the top and rear of the case
  • On the front or side of the case

    Locating the product label on the front and side of the case
  • On the box the computer shipped in

    Locating the product label

Reset the CMOS

Reset Complementary Metal Oxide Semiconductor (CMOS) data for your computer.

CAUTION:

This product contains components that can be damaged by electrostatic discharge (ESD). HP recommends using an anti-static wrist strap and working over a non-carpeted floor with a conductive foam pad to reduce the to reduce the chance of electrostatic discharge (ESD) damage.

  1. Turn off your computer, and then disconnect the power cord and any cables from the computer.

  2. Make sure you have the model number for your computer, go to HP Customer Support, and then navigate to the product page for your computer.

  3. Open the specifications document or service guide for motherboard information, and then locate the steps for resetting the CMOS.

    The steps for resetting the CMOS might named Clearing CMOS or similar.

    • If the guide lists steps to reset the CMOS: Follow the instructions.

    • If the guide does not list steps to reset the CMOS: Continue with these steps.

  4. With the computer turned off, press the Power button ten (10) times to fully discharge electricity form the system.

  5. Ground yourself to discharge any static electricity by placing one hand on the case of the computer, and then touch the other hand to a metal surface or grounded object, such as the metal part of a lamp.

  6. Open the computer to access to the motherboard.

  7. Remove or disconnect the CMOS battery from the motherboard.

    Example of different CMOS battery types
  8. Confirm all sources of electricity are removed or disconnected from the computer, including the CMOS battery.

  9. Press the Power button for a minimum of 60 seconds to drain all power from the computer and reset the CMOS values on the motherboard.

  10. Reconnect or reinstall the CMOS battery, and then close the computer.

  11. Plug in the power cord to the desktop, and then turn on the computer.

    A message displays confirming the CMOS reset. The message varies by model.

    Example message that displays to indicate the CMOS reset
  12. Confirm the Time in BIOS is set to 00:00.

    If not, repeat the steps to reset the CMOS, but press and hold the Power button for 120 seconds when draining all the power from the computer.

Update the PC with HP Support Assistant

Use HP Support Assistant to find and install updates, including BIOS updates, for your computer with Windows.

  1. In Windows, search for and open HP Support Assistant, or click the app icon in the taskbar.

    If the app is not installed on your computer, download the latest version from the HP Support Assistant website.
  2. On the My devices tab, find your computer, and then click Updates.

  3. Click Check for updates and messages to get the latest updates.

  4. Wait while HP Support Assistant analyzes the system.

  5. After the analysis completes, select the listed updates, download and install the updates, and then follow any on-screen instructions.

  6. If prompted, restart the computer, and then close the tool.

Replace the affected component

Replace the affected part or component if the issue persists after completing all the preceding steps.

Contact HP Customer Support to schedule a product repair or replacement. If you are in Asia Pacific, you are directed to a local service center in your area.

To confirm your warranty status, go to HP Product Warranty Check. Repair fees might apply for out-of-warranty products.

The red light blinks five times, and then three, short white light blinks

This condition indicates the component cannot be not reached by the BIOS within the established time limit.

  1. Reseat the component.

  2. Test your system with a known good component.

  3. Contact HP Customer Support for further assistance to replace the component or system board if the issue persists.

The red light blinks five times, and then four, short white light blinks

This condition indicates the system board is not initializing quickly enough for component.

  1. Confirm the correct power supply is being used for the computer.

  2. Reset the CMOS.

  3. Reseat components.

  4. Test your system with a known good component.

  5. Contact HP Customer Support for further assistance to replace any defective parts found.

Contact HP Customer Support

Contact HP Customer Support for further assistance if the issue persists.

  1. Go to HP Customer Support - Contact.

  2. Enter your product serial number to view warranty status and to change your location, if necessary.

  3. Select a support option. Support options vary by country/region.


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Country/Region: Flag United States

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