ℹ
info HP
Status LED blinks when power on/off button pressed for extended time
Indicates a machine report or shutdown is initiated.
? What Causes This
Control panel button held for long duration.
ⓘ What This Means
Press and hold power button to initiate desired action such as shutting down the system.
Source: page 15 of the official manual
From the manual
This error code appears in:
HP Samsung Xpress SL M2071 Laser Multifunction Printer Series