Q-Leds; Pin Power Plug Led - Asus ROG STRIX Z490-A GAMING Manual

20.

Q-LEDs

The Q-LEDs check key components (CPU, DRAM, VGA, and booting devices) during
the motherboard booting process. If an error is found, the critical component's LED
stays lit up until the problem is solved.
The Q-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.
21.

8-pin Power Plug LED

The 8-pin Power Plug LED lights up to indicate that the 8-pin power plug is not
connected.
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Chapter 1: Product Introduction