info HP

Status Blinking Power light

Indicates computer in sleep mode or low power state, awaiting user interaction to resume.

? What Causes This

Power management options setting the device into a low-power state upon inactivity.

What This Means

- Press appropriate keys or touchpad button (fn + F12) - Ensure BIOS or OS settings allow for proper wake up

Source: page 18 of the official manual

From the manual

Manual page 18 — HP error Blinking Power light

This error code appears in:

HP Elitebook 850 G3 Notebook PC