!
error HP
Error Code 4 long red blinks
Embedded controller has timed out waiting for BIOS to return from memory initialization.
? What Causes This
System board malfunction or embedded controller issues.
✓ How to Fix It
Consider replacing the system board if software solutions do not work. Contact service provider for precise diagnostics.
Source: page 70 of the official manual
From the manual
This error code appears in:
HP Elitebook 840 G4 Notebook PC