What do the Q LEDs on the motherboard mean during boot?

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