Onboard Leds; Ez Debug Led; Pcie X16 Slot Leds; Dimm Leds - MSI X399 GAMING PRO CARBON AC Manual

Onboard LEDs

EZ Debug LED

These LEDs indicate the debug status of the motherboard.

PCIe x16 slot LEDs

These LED indicate the PCIe x16 slots status.

DIMM LEDs

These LED indicate the memory modules are installed.

XMP LED

This LED indicates the XMP (Extreme Memory Profile) mode is enabled.
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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.
PCI_E1 LED
PCI_E3 LED
PCI_E4 LED
PCI_E6 LED
DIMM LEDs
XMP LED
LED color PCIe slot status
Red x16 mode
White x8, x4, x1 mode