User Guide

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