ℹ
info HP
Status LED 3 blinks at 1Hz followed by a pause of 2 seconds (Green LED)
System in Stand By mode.
? What Causes This
Operating system or user settings controlled the standby behavior.
ⓘ What This Means
Press computer's power button to resume operation from stand-by state.
Source: page 27 of the official manual
From the manual
This error code appears in:
HP Compaq Pro 6300 SF Desktop