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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. The following information describes 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, press the Power button again to repeat the blinking sequence.
Specific patterns of long and short blinks along with long and short beeps (where applicable) identify errors during the startup process. Newer computers have two-part blink sequences with different color lights to indicate specific errors. The LED blink/beep sequence near Caps Lock and Number Lock keys indicates the type of error:
  • The red Caps Lock LED blinks are long.
  • The white Caps Lock LED blinks are short. For example, ‘3.5’ indicates 3 long red blinks and 5 short white blinks.
  • On systems that do not have a dual-color LED, both long and short blinks are white.
  • Some systems do not have a speaker and do not beep.
Note the blinking sequence and use the chart to identify the error condition. Then use the troubleshooting steps to solve the issue.
Component tested
Light and beep pattern
Error condition
Troubleshooting steps
BIOS
2.2 (blink)
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). Go to HP Notebook PCs - Recovering the BIOS for additional information.
BIOS
2.3 (blink)
The embedded controller policy requires the user to enter a key sequence.
Disconnect the power supply and power the computer with battery power. This resets 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).
    The computer powers on and should boot normally.
  4. Re-connect the AC power to the computer.
BIOS
2.4 (blink)
The embedded controller is checking or recovering the boot block.
Disconnect the power supply and power the computer with battery power. This resets 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).
    The computer powers on and should boot normally.
  4. Re-connect the AC power to the computer.
Hardware
3.2 (blink)
The embedded controller times 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. You might also consider contacting support for repair due to a possible RAM or system board failure.
Hardware
3.3 (blink/beep)
The embedded controller times out waiting for BIOS to return from graphics initialization or if a graphics output device failed to initialize.
Contact support for repair due to graphics or video failure.
Hardware
3.4 (blink)
The system board displays a power failure.
Check the power cable connections. Verify that any external power adapter has sufficient capacity for the system.
Hardware
3.5 (blink)
The CPU is not detected.
Contact support for repair due to system board or CPU failure.
Thermal
4.2 (blink/beep)
A CPU overheating condition detected.*
Allow the computer to cool down, then go to the section Removing dust from the cooling areas in a notebook.
Thermal
4.3 (blink/beep)
An ambient temperature overheating condition 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)
A GPU (graphics processing unit) overheating condition detected.
System board
5.2 (blink)
The embedded controller cannot find valid firmware.
Disconnect the power supply and power the computer with battery power. This resets 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).
    The computer powers on and should boot normally.
  4. Re-connect the AC power to the computer.
System board
5.3 (blink)
The embedded controller times 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)
The embedded controller times out waiting for the BIOS to return from system board initialization (end of POST).

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