User manual
1-10
Chapter 1: Product Introduction
Chapter 1
3. MemOK! button
InstallingDIMMsthatarenotcompatiblewiththemotherboardmaycausesystemboot
failure.IfthesystemfailtobootduringPOSTstageandtheDRAM_LEDneartheMemOK!
buttonlightscontinuously,presstheMemOK!buttonuntiltheDRAM_LEDstartsblinking.
Systemwillbeginautomaticmemorycompatibilitytuningandrebootforsuccessfulboot.
• Refertosection1.1.8 Onboard LEDsfortheexactlocationoftheDIAG_DRAMLED.
• TheDIAG_DRAMLEDalsolightsupwhentheDIMMisnotproperlyinstalled.Turnoff
thesystemandreinstalltheDIMMbeforeusingtheMemOK!function.
• TheMemOK!buttondoesnotfunctionunderWindows
®
OSenvironment.
• Duringthetuningprocess,thesystemloadsandtestsfailsafememorysettings.It
takesabout30secondsforthesystemtotestonesetoffailsafesettings.Ifthetest
fails,thesystemrebootsandteststhenextsetoffailsafesettings.Theblinkingspeed
oftheDIAG_DRAMLEDincreases,indicatingdifferenttestprocesses.
• Duetomemorytuningrequirement,thesystemautomaticallyrebootswheneach
timingsetistested.IftheinstalledDIMMsstillfailtobootafterthewholetuning
process,theDIAG_DRAMLEDlightscontinuously.ReplacetheDIMMswithones
recommendedintheMemoryQVL(QualiedVendorsLists)inthisusermanualorat
www.asus.com.
• IfyouturnoffthecomputerandreplaceDIMMsduringthetuningprocess,thesystem
continuesmemorytuningafterturningonthecomputer.Tostopmemorytuning,turn
offthecomputerandunplugthepowercordforabout5–10seconds.
• IfyoursystemfailstobootupduetoBIOSoverclocking,presstheMemOK!button
tobootandloadtheBIOSdefaultsettings.AmessagewillappearduringPOST
remindingyouthattheBIOShasbeenrestoredtoitsdefaultsettings.
• WerecommendthatyoudownloadandupdatetothelatestBIOSversionfrom
www.asus.comafterusingtheMemOK!function.