!!
critical HP
Error Code 2 short white blinks
The main area (DXE) of BIOS has become corrupted with no recovery available.
? What Causes This
BIOS corruption, software update issues or system malfunction.
✓ How to Fix It
Press Up Arrow+ Down Arrow+ Esc to restore BIOS and boot. If ineffective, contact service provider for a full BIOS recovery image.
Source: page 69 of the official manual
From the manual
This error code appears in:
HP Elitebook 840 G4 Notebook PC