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Light and beep pattern  | Component tested  | Error condition  | Troubleshooting steps  | 
2.2 (blink)  | BIOS  | 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.  | 
2.3 (blink)  | BIOS  | 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. 
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2.4 (blink)  | BIOS  | 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. 
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3.2 (blink)  | Hardware  | 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.  | 
3.3 (blink/beep)  | Hardware  | 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.  | 
3.4 (blink)  | Hardware  | The system board displays a power failure.  | Check the power cable connections. Verify that any external power adapter has sufficient capacity for the system.  | 
3.5 (blink)  | Hardware  | The CPU is not detected.  | Contact support for repair due to system board or CPU failure.  | 
4.2 (blink/beep)  | Thermal  | 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.  | 
4.3 (blink/beep)  | Thermal  | 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.  | 
4.4 (blink/beep)  | Thermal  | A GPU (graphics processing unit) overheating condition detected.  | |
5.2 (blink)  | System board  | 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. 
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5.3 (blink)  | System board  | 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.  | 
5.4 (blink/beep)  | System board  | The embedded controller times out waiting for the BIOS to return from system board initialization (end of POST).  |