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error HP
Error Code Blink = 4
The embedded controller has timed out waiting for BIOS to return from graphics initialization, possibly indicating a missing or faulty MXM module.
? What Causes This
Graphics driver configuration did not complete successfully in the expected time frame.
✓ How to Fix It
If an MXM module is used, trying a different module may resolve. Otherwise, replace the system board.
Source: page 84 of the official manual
From the manual
This error code appears in:
HP Elitebook 840 G5 Notebook PC