Lenovo Personal Computer 4155 User Manual Page 80

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POSTerrorcodes
Eachtimeyoupower-onthesystem,itperformsaseriesofteststhatchecktheoperationofthesystem
andsomeoptions.ThisseriesoftestsiscalledthePower-OnSelf-Test,orPOST.POSTdoesthefollowing
operations.
Checkssomebasicsystem-boardoperations
Checksthememoryoperation
Startsthevideooperation
Veriesthatthebootdriveisworking
IfthePOSTdetectsaproblem,anerrormessageappearsonthescreen.Asingleproblemcancauseseveral
errormessagestoappear.Whenyoucorrectthecauseofthersterrormessage,theothererrormessages
probablywillnotappearonthescreenthenexttimeyouturnonthesystem.
POSTErrorMessageDescription/Action
CMOSbatteryfailedTheCMOSbatteryisnolongerfunctional.
Replacethebattery.
CMOSchecksumerror-defaultsloadedChecksumofCMOSisincorrect.
Thecomputerloadsthedefaultcongurationsettings.
ThiserrormightindicatethatCMOShasbecomecorrupt
duetoaweakCMOSbattery.
CPUatnnnn
nnnnistherunningspeedofthemicroprocessor.
PressEsctoskipmemorytest
PressingEscskipsthefullmemorytest
HARDDISKINSTALLFAILURECannotndorinitializetheharddiskdrivecontrolleror
thedrive.
Makesuretheharddiskdriveiscorrectlyinstalled.
Ifnoharddiskdrivesareinstalled,makesurethehard
diskdriveselectioninSetupissettoNONE.
Keyboarderrorornokeyboardpresent
Cannotinitializethekeyboard.
Makesurethekeyboardisproperlyconnectedtothe
computerandthatnokeysareheldpressedduringPOST.
Topurposelycongurethecomputerwithoutakeyboard,
settheerrorhaltconditioninSetuptoHALTONALL,BUT
KEYBOARD.TheBIOSthenignoresthemissingkeyboard
duringPOST.
MemoryTest:
Thismessagedisplaysduringafullmemorytest,counting
downthememoryareasbeingtested.
Memorytestfail
IfPOSTdetectsanerrorduringmemorytesting,additional
informationappears.Thisinformationgivesspecics
aboutthetypeandlocationofthememoryerror.
72ThinkStationHardwareMaintenanceManual
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