•IftheLEDisnotilluminated(off),gotostep2onpage34
2.CheckthestatusofthepowerindicatorLEDontheAC/DCpoweradapter.
•IftheLEDisilluminated(on),gotostep7onpage34
.
•IftheLEDisnotilluminated(off),gotothenextstep3onpage34
.
3.VerifythatthepowercordisproperlyconnectedtoanACpoweroutlet.
4.VerifythatyouareusingagoodACpoweroutlet.Pluganotherdeviceintotheoutletorcontactthe
powercompanyorsuppliertoverifythattheoutletisworkingcorrectly.
5.Checkthepowercordcontinuity.
6.ReplacetheAC/DCpoweradapter.
7.VerifythatthepowercordfromtheAC/DCpoweradaptertothecomputerisproperlyconnected.See
“Locatingconnectorsontherearofyourcomputer”onpage70.
8.Openthecover.See“Openingthecomputercover”onpage72.
9.Checkthepowerswitch/LEDassemblyconnectoronthesystemboard.See“Locatingpartsonthe
systemboard”onpage71
.Reseatthecablefromthepowerswitch/LEDassemblytothesystemboard.
10.Replacethepowerswitch/LEDassembly.
11.Replacethesystemboard.See“Replacingthesystemboard”onpage86.
Problemdeterminationtips
Duetothevarietyofhardwareandsoftwarecombinationsthatcanbeencountered,usethefollowing
informationtoassistyouinproblemdetermination.Ifpossible,havethisinformationavailablewhen
requestingassistancefromServiceSupportandEngineeringfunctions.
•Machinetypeandmodel
•Processororharddiskdriveupgrades
•Failuresymptom
–Dodiagnosticsindicateafailure?
–What,when,where,single,ormultiplesystems?
–Isthefailurerepeatable?
–Hasthiscongurationeverworked?
–Ifithasbeenworking,whatchangesweremadepriortoitfailing?
–Isthistheoriginalreportedfailure?
•Diagnosticsversion
–Typeandversionlevel
•Hardwareconguration
–Print(printscreen)congurationcurrentlyinuse
–BIOSlevel
•Operatingsystemsoftware
–Typeandversionlevel
Notes:Toeliminateconfusion,identicalsystemsareconsideredidenticalonlyifthey:
1.Aretheexactmachinetypeandmodels
2.HavethesameBIOSlevel
3.Havethesameadapters/attachmentsinthesamelocations
4.Havethesameaddressjumpers/terminators/cabling
34ThinkCentreHardwareMaintenanceManual
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