What do the EZ Debug LEDs indicate on the B550-A Pro?

The four EZ Debug LEDs indicate the following failure states: CPU (CPU not detected or failed), DRAM (memory not detected or failed), VGA (GPU/PCIe/M.2 device not detected or failed), and BOOT (booting device not detected or failed). These LEDs help you quickly identify which component is causing a boot issue. (Page 42)