Lenovo IdeaCentre A520 All-in-One User Manual Page 26

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POSTerrorcodes
Eachtimeyouturnthecomputeron,itperformsaseriesofteststocheckthatthesystemisoperating
correctlyandthatcertainoptionsareset.ThisseriesoftestsiscalledthePower-OnSelf-Test,orPOST.
POSTdoesthefollowing:
Checkssomebasicmotherboardoperations
Checksthatthememoryisworkingcorrectly
Startsvideooperations
Veriesthatthebootdriveisworking
POSTErrorMessageDescription/Action
Keyboarderror
Cannotinitializethekeyboard.Makesurethekeyboard
isproperlyconnectedtothecomputerandthatnokeys
areheldpressedduringPOST.Topurposelycongure
thecomputerwithoutakeyboard,selectKeyboardless
operationinStartupandsettheoptiontoEnabled.The
BIOSthenignoresthemissingkeyboardduringPOST.
RebootandSelectproperBootdeviceorInsertBoot
MediainselectedBootdevice
TheBIOSwasunabletondasuitablebootdevice.Make
surethebootdriveisproperlyconnectedtothecomputer.
Makesureyouhavebootablemediainthebootdevice.
Undeterminedproblems
1.Power-offthecomputer.
2.Removeordisconnectthefollowingcomponents(ifconnectedorinstalled)oneatatime.
a.Externaldevices(modem,printer,ormouse)
b.Extendedvideomemory
c.ExternalCache
d.ExternalCacheRAM
e.Harddiskdrive
f.Diskdrive
3.Power-onthecomputertore-testthesystem.
4.Repeatsteps1through3untilyoundthefailingdeviceorcomponent.
Ifalldevicesandcomponentshavebeenremovedandtheproblemcontinues,replacethesystemboard.
20IdeaCentreA520All-In-OnePCHardwareMaintenanceManual
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