!!
critical ASUS
Error Code LEDs Off During Bootup
Potential power supply failure or absence of motherboard's main power signal.
? What Causes This
Inadequate mainboard voltage; PSU malfunction, loose ATX connector in place/socket.
✓ How to Fix It
Ensure sufficient power supply (check PSU wattage), confirm proper plug-in on motherboard插座被拔出或电源线路松动。
Source: page 12 of the official manual
From the manual
This error code appears in:
ASUS Tuf Gaming H770 Pro Wifi Motherboard