ASUS ROG Maximus Z790 Dark Hero Diagnostics
Classification: PC Hardware & Motherboards Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the ASUS ROG Maximus Z790 Dark Hero.
Indexed Fault Codes for ROG Maximus Z790 Dark Hero
Step-by-step resolution manuals and root cause matrices
DDR5 Memory Not Installed
Q-Code 55 denotes 'Memory not installed', indicating the memory controller (IMC) failed to detect or train DDR5 modules during initial Power-On Self-Test (POST). This typically stems from uneven CPU socket mounting pressure bending LGA1700 pins, marginal memory training timing under aggressive XMP/EXPO profiles on cold boot, or insufficient VDD/VDDQ/MC voltage rail supply.
Q-Code 55 Memory Not Installed
POST hangs during SEC/PEI phase at Q-Code 55 indicating memory initialization failure. The integrated memory controller (IMC) fails to detect or establish communication with DDR5 modules across the SPI/SMBus or data lanes.