!!
critical HP
Error Code Blink = 7 (2 BB failure)
The embedded controller cannot find valid firmware or two boot block failures have occurred.
? What Causes This
BIOS firmware corruption or invalid configuration causing multiple boot failure instances.
✓ 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