MSI MEG Z690 UNIFY Manuel D'utilisation page 54

Onboard LEDs
EZ Debug LED
These LEDs indicate the debug status of the motherboard.
Debug Code LED
The Debug Code LED displays progress and error codes during and after POST. Refer
to the Debug Code LED table for details.
Hexadecimal Character Table
Hexadecimal
Debug Code
LED display
Boot Phases
Security (SEC) – initial low-level initialization
Pre-EFI Initialization (PEI) – memory initialization
Driver Execution Environment (DXE) – main hardware initialization
Boot Device Selection (BDS) – system setup, pre-OS user interface & selecting a
bootable device (CD/DVD, HDD, USB, Network, Shell, ...)
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Onboard LEDs
CPU - indicates CPU is not detected or fail.
DRAM - indicates DRAM is not detected or fail.
VGA - indicates GPU is not detected or fail.
BOOT - indicates the booting device is not detected
or fail.
Debug Code LED
0 1 2 3 4
0 1 2 3 4 5 6 7 8 9 A B C D E F
5 6 7 8 9 A B C D E F