Asus WS Z390 PRO - Onboard Leds

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Chapter 1: Product Introduction
Chapter 1
1.1.7 Onboard LEDs
1. POST State LEDs
ThePOSTStateLEDsprovidethestatusofthesekeycomponentsduringPOST
(Power-OnSelf-Test):CPU,memorymodules,VGAcard,andharddiskdrives.Ifan
errorisfound,thecriticalcomponent’sLEDstayslitupuntiltheproblemissolved.
ThePOSTStateLEDsprovidethemostprobablecauseofanerrorcodeasastartingpoint
fortroubleshooting.Theactualcausemayvaryfromcasetocase.
2. Memory LED (Mem_LED)
TheMem_LEDwilllightupandremainlitwhiletheMemOK!IIfunctionisinuse.When
there-trainingiscomplete,theMem_LEDwillturnoff.