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

This document is for HP and Compaq notebook computers.
If your computer does not start, light emitting diodes (LEDs) or beeps can help identify the issue. Use the following information to help you learn more about the flashing light and beeping error codes and how to resolve the problem.
Notebook computer with lid open and showing animated lights blinking on and off.
note:
If the LEDs stop blinking and the computer does not start, you can press the Power button again to repeat the tests. After you count the number of blinks, use the chart to identify the error condition, and then see the corresponding section for that error condition below for troubleshooting steps.
Knowing the number of blinks is helpful when you contact an HP support agent for technical help.
Depending on the notebook type, the slow blinks are red and the quick blinks are white. On systems that do not have a dual-color LED, both slow and fast blinks are white. Some systems do not have a speaker and do not beep.
Component tested
Light and beep pattern
Error condition
Troubleshooting steps
BIOS
2.2 (blink)
Caps Lock LED blinks slow 2 times followed by 2 quick blinks.
The main area (DXE) of BIOS has become corrupted, and there is no recovery binary image available. (Also happens when updating the BIOS.)
Perform BIOS recovery with external media (USB or CD-ROM). For information on how to restore the BIOS refer to the HP support document: HP Notebook PCs - Restoring the BIOS.
BIOS
2.3 (blink)
Caps lock LED blinks slow 2 times followed by 3 quick blinks.
The embedded controller policy requires the user to enter a key sequence.
Be sure the battery is installed in the computer and it has sufficient power before continuing. Due to the design of the Embedded Controller/Keyboard Controller, the power supply must be disconnected and the computer must be powered with battery power to reset the Embedded Controller/Keyboard Controller.
  1. Unplug the AC power from the computer.
  2. Press and hold the power button for more than 12 seconds.
  3. Release the power button (after at least 12 seconds).
  4. The computer will power on and should boot normally after releasing the power button.
  5. Re-connect the AC power to the computer.
BIOS
2.4 (blink)
Caps lock LED blinks slow 2 times followed by 4 quick blinks.
The embedded controller is checking or recovering the boot block.
Be sure the battery is installed in the computer and it has sufficient power before continuing. Due to the design of the Embedded Controller/Keyboard Controller, the power supply must be disconnected and the computer must be powered with battery power to reset the Embedded Controller/Keyboard Controller.
  1. Unplug the AC power from the computer.
  2. Press and hold the power button for more than 12 seconds.
  3. Release the power button (after at least 12 seconds).
  4. The computer will power on and should boot normally after releasing the power button.
  5. Re-connect the AC power to the computer.
Hardware
3.2 (blink)
Caps Lock LED blinks slow 3 times followed by 2 quick blinks.
The embedded controller has timed out waiting for BIOS to return from memory initialization.
Reseat the memory. See the section Reseating memory modules in a notebook for more information.
If reseating the memory does not resolve the problem, try replacing the memory modules, or contact support for repair due to a possible RAM or system board failure.
Hardware
3.3 (blink/beep)
Caps Lock LED blinks slow 3 times followed by 3 quick blinks, accompanied by beeps (lower tone and higher tone).
The embedded controller has timed out waiting for BIOS to return from graphics initialization or failed to initialize a graphics output device.
Contact support for repair due to graphics or video failure.
Hardware
3.4 (blink)
Caps lock LED blinks slow 3 times followed by 4 quick blinks.
The system board displays a power failure.
Check the power cable connections, or verify that any external power adapter has sufficient capacity for the system.
Hardware
3.5 (blink)
Caps Lock LED blinks slow 3 times followed by 5 quick blinks.
The CPU is not detected.
Contact support for repair due to system board or CPU failure.
Hardware
3.6 (blink)
Caps lock LED blinks slow 3 times followed by 6 quick blinks.
Unsupported CPU installed in the system (for TXT only).
This should only be available on Intel desktop. It shows error when user replace CPU from TXT supported and enabled in F10 to non-TXT supported CPU.
Thermal
4.2 (blink/beep)
Caps Lock LED blinks slow 4 times followed by 2 quick blinks, accompanied by beeps (lower tone and higher tone).
A CPU overheating condition has been detected.*
Allow the computer to cool down, and then follow the steps in the section Removing dust from the cooling areas in a notebook.
Thermal
4.3 (blink/beep)
Caps Lock LED blinks slow 4 times followed by 3 quick blinks, accompanied by beeps (lower tone and higher tone).
An ambient temperature overheating condition has been detected.
If the error persists after cooling and cleaning the notebook, there might be heat-related damage to internal components. Contact support for repair.
Thermal
4.4 (blink/beep)
Caps Lock LED blinks slow 4 times followed by 4 quick blinks, accompanied by beeps (lower tone and higher tone).
A GPU (graphics processing unit) overheating condition has been detected.
System board
5.2 (blink)
Caps lock LED blinks slow 5 times followed by 2 quick blinks.
The embedded controller cannot find valid firmware.
Be sure the battery is installed in the computer and it has sufficient power before continuing. Due to the design of the Embedded Controller/Keyboard Controller, the power supply must be disconnected and the computer must be powered with battery power to reset the Embedded Controller/Keyboard Controller.
  1. Unplug the AC power from the computer.
  2. Press and hold the power button for more than 12 seconds.
  3. Release the power button (after at least 12 seconds).
  4. The computer will power on and should boot normally after releasing the power button.
  5. Re-connect the AC power to the computer.
System board
5.3 (blink)
Caps Lock LED blinks slow 5 times followed by 3 quick blinks.
The embedded controller has timed out waiting for the BIOS.
Remove all accessory devices from the notebook.
If the error code persists, contact support for possible repair.
System board
5.4 (blink/beep)
Caps Lock LED blinks slow 5 times followed by 4 quick blinks, accompanied by beeps (lower tone and higher tone).
The embedded controller has timed out waiting for the BIOS to return from system board initialization (end of POST).

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