•Checksthememoryoperation
•Startsthevideooperation
•Veriesthatthebootdriveisworking
IfthePOSTdetectsaproblem,anerrormessageappearsonthescreen.Asingleproblemcancauseseveral
errormessagestoappear.Whenyoucorrectthecauseofthersterrormessage,theothererrormessages
probablywillnotappearonthescreenthenexttimeyouturnonthesystem.
POSTErrorMessageDescription/Action
CMOSChecksumBadChecksumofCMOSisincorrect.Thecomputerloadsthe
defaultcongurationsettings.Thiserrormightindicate
thatCMOShasbecomecorruptduetoaweakCMOS
battery.
Systemcannotconnectfanorfanmodulesarebroken.
Reseatthefan,orreplacewithknowngoodmodules.
Undeterminedproblems
IfthiscomputerhasaparallelATAharddiskdrive,makesurethattheharddiskdriveisjumperedasa
masterandtheopticaldriveisjumperedasaslave.
1.Power-offthecomputer.
2.Removeordisconnectthefollowingcomponents(ifinstalled)oneatatime.
a.Externaldevices(modem,printer,ormouse)
b.Anyadapters
c.Memorymodules
d.Extendedvideomemory
e.ExternalCache
f.ExternalCacheRAM
g.Harddiskdrive
h.Diskettedrive
3.Power-onthecomputertore-testthesystem.
4.Repeatsteps1through3untilyoundthefailingdeviceoradapter.
Ifalldevicesandadaptershavebeenremoved,andtheproblemcontinues,replacethesystemboard.
18IdeaCentreB520eHardwareMaintenanceManual
Comments to this Manuals