Asus WS Z390 PRO Manual page 27

3. Hard Disk LED (HD_LED)
The Hard Disk LED is designed to indicate the hard disk activity. It blinks when data
is being written into or read from the hard disk drive. The LED does not light up when
there is no hard disk drive connected to the motherboard or when the hard disk drive
does not function.
4. Q-Code LED
The Q-Code LED design provides you with a 2-digit error code that displays the system
status. Refer to the Q-Code table on the next page for details.
• The Q-Code LEDs provide the most probable cause of an error code as a starting
point for troubleshooting. The actual cause may vary from case to case.
• Please refer to the Q-Code table in the Appendix section for more details.
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