⚠
warning HP
Error Code LED blinking green slowly
Printer is not functioning or completing self-test initialization — check cable connections.
? What Causes This
Power disruption issue; loose connections or network disconnection.
✓ How to Fix It
Reconnect cables and ensure all power cables are securely connected. Run diagnostics.
Source: page 152 of the official manual
From the manual
This error code appears in:
HP Laserjet 1300 Printer