!!
critical HP
Error Code LED blinks 3 times (red) and LED blinks 5 times (white)
System board displays a power failure.
? What Causes This
Power regulation component failure or short circuit.
✓ How to Fix It
- Disconnect any peripheral devices.
- If problem persists, replace the system board.
Source: page 74 of the official manual
From the manual
This error code appears in:
HP Elitebook 840 G6 Notebook PC