ℹ
info HP
Status Power LED off - Disconnection Indicator
The machine is powered off or disconnected from a power source.
? What Causes This
Unplugging, shutdown sequence initiated, or connection issues with the electrical outlet.
ⓘ What This Means
Reconnect the cable or check for proper connectivity in the outlet/socket before rebooting.
Source: page 43 of the official manual
From the manual
This error code appears in:
HP Samsung Xpress SL M2020 Laser Printer Series