What do the Q LED lights on the motherboard mean during boot?

The Q LEDs check key components — CPU, DRAM, VGA card, and boot devices — in sequence during the motherboard's booting process. If an error is found, the corresponding LED remains lit until the problem is solved, providing an intuitive way to identify the root cause of a boot failure within seconds. The Q LEDs provide the most probable cause of an error code as a starting point for troubleshooting, though the actual cause may vary. (Page 1-10)