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)
From the official Msi B550-A Pro Motherboard manual, page 42
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