POSTerrorcodes
Eachtimeyoupower-onthesystem,itperformsaseriesofteststhatchecktheoperationofthesystem
andsomeoptions.ThisseriesoftestsiscalledthePower-OnSelf- Test,orPOST.POSTdoesthefollowing
operations.
•Checkssomebasicsystem-boar doperations
•Checksthememoryoperation
•Startsthevideooperation
•Veriesthatthebootdriveisworking
IfthePOSTdetectsaproblem,anerrormessageappearsonthescreen.Asingleproblemcancauseseveral
errormessagestoappear.Whenyoucorrectthecauseofthersterrormessage,theothererrormessages
probablywillnotappearonthescreenthenexttimeyouturnonthesystem.
POSTErrorMessageDescription/Action
CMOSbatteryfailedTheCMOSbatteryisnolongerfunctional.
Replacethebattery.
CMOSchecksumerror-defaultsloadedChecksumofCMOSisincorrect.
Thecomputerloadsthedefaultcongurationsettings.
ThiserrormightindicatethatCMOShasbecomecorrupt
duetoaweakCMOSbattery.
CPUatnnnnnnnnistherunningspeedofthemicroprocessor.
PressEsctoskipmemorytestPressingEscskipsthefullmemorytest
HARDDISKINSTALLFAILURECannotndorinitializetheharddiskdrivecontrolleror
thedrive.
Makesuretheharddiskdriveiscorrectlyinstalled.
Ifnoharddiskdrivesareinstalled,makesurethehard
diskdriveselectioninSetupissettoNONE.
KeyboarderrorornokeyboardpresentCannotinitializethekeyboard.
Makesurethekeyboardisproperlyconnectedtothe
computerandthatnokeysareheldpressedduringPOST.
Topurposelycongurethecomputerwithoutakeyboard,
settheerrorhaltconditioninSetuptoHALTONALL,BUT
KEYBOARD.TheBIOSthenignoresthemissingkeyboard
duringPOST.
MemoryTest:Thismessagedisplaysduringafullmemorytest,counting
downthememoryareasbeingtested.
MemorytestfailIfPOSTdetectsanerrorduringmemorytesting,additional
informationappears.Thisinformationgivesspecics
aboutthetypeandlocationofthememoryerror.
62ThinkCentreHardwareMaintenanceManual