!!
critical HP
Error Code Blink = 5
The system board displays a power failure (crowbar), indicating an extreme overcurrent or overvoltage event.
? What Causes This
Severe electrical fault likely indicated by the crowbar circuit tripping.
✓ How to Fix It
System board replacement.
Source: page 84 of the official manual
From the manual
This error code appears in:
HP Elitebook 840 G5 Notebook PC