Asus Z270-WS - Page 26

1-10
Chapter 1: Product Introduction
Chapter 1
3. MemOK! button
InstallingDIMMsthatarenotcompatiblewiththemotherboardmaycausesystem
bootfailure,andtheDIAG_DRAMLEDlightscontinuously.Pressandholdthe
MemOK!buttonuntiltheDIAG_DRAMLEDstartsblinkingtobeginautomaticmemory
compatibilitytuningforsuccessfulboot.
 Refertosection1.1.8 Onboard LEDsfortheexactlocationofthePOSTStateLEDs
(DIAG_DRAM).
 TheDIAG_DRAMalsolightsupwhentheDIMMisnotproperlyinstalled.Turnoffthe
systemandreinstalltheDIMMbeforeusingtheMemOK!function.
 TheMemOK!buttondoesnotfunctionunderWindows
®
OSenvironment.
 Duringthetuningprocess,thesystemloadsandtestsfailsafememorysettings.It
takesabout30secondsforthesystemtotestonesetoffailsafesettings.Ifthetest
fails,thesystemrebootsandteststhenextsetoffailsafesettings.Theblinkingspeed
oftheDIAG_DRAMincreases,indicatingdifferenttestprocesses.
 Duetomemorytuningrequirement,thesystemautomaticallyrebootswheneach
timingsetistested.IftheinstalledDIMMsstillfailtobootafterthewholetuning
process,theDIAG_DRAMlightscontinuously.ReplacetheDIMMswithones
recommendedintheMemoryQVL(QualiedVendorsLists)atwww.asus.com.
 IfyouturnoffthecomputerandreplaceDIMMsduringthetuningprocess,thesystem
continuesmemorytuningafterturningonthecomputer.Tostopmemorytuning,turn
offthecomputerandunplugthepowercordforabout510seconds.
 IfyoursystemfailstobootupduetoBIOSoverclocking,presstheMemOK!button
tobootandloadtheBIOSdefaultsettings.AmessagewillappearduringPOST
remindingyouthattheBIOShasbeenrestoredtoitsdefaultsettings.
 WerecommendthatyoudownloadandupdatetothelatestBIOSversionfrom
www.asus.comafterusingtheMemOK!function.