!
error HP
Error Code LED flashes Red three times then White four times.
Power failure (power supply overload).
? What Causes This
Overloaded PSU due connected devices, unbalanced power source, or faulty components.
✓ How to Fix It
- Ensure correct voltage setting based on geographic location using selector switch if equipped.
- Confirm system board connector seating for power cable.
Source: page 79 of the official manual
From the manual
This error code appears in:
HP Prodesk 400 G3 Desktop Mini PC