Lenovo M78 User's Guide Page 121
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- Table of contents
- TROUBLESHOOTING
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Action:IftheTransceiverCommunicationsLEDisnoton,reconnectthetransceiverandthekeyboard.
Monitorproblems
Note:Manymonitorshavestatus-indicatorlightsandbuilt-incontrolsforadjustingbrightness,contrast,
width,height,andotherpictureadjustments.However,thecontrolsvaryfrommonitortypetomonitortype.
Forinformationaboutthestatuslightsandusingthecontrols,refertothedocumentationthatcomes
withyourmonitor.
Selectyoursymptomfromthefollowinglist:
•“Wrongcharactersappearonthescreen”onpage109
•“Themonitorworkswhenyouturnonthecomputer,butgoesblankaftersomeperiodofcomputer
inactivity”onpage109
•“Themonitorworkswhenyouturnonthecomputer,butgoesblankwhenyoustartsomeapplication
programs”onpage109
•“Theimageappearstobeickering”onpage109
•“Theimageisdiscolored”onpage110
Wrongcharactersappearonthescreen
Symptom:Wrongcharactersappearonthescreen.
Action:Havethecomputerserviced.Fordetails,seeChapter11“Gettinginformation,help,andservice”on
page119.
Themonitorworkswhenyouturnonthecomputer,butgoesblankaftersomeperiod
ofcomputerinactivity
Symptom:Themonitorworkswhenyouturnonthecomputer,butgoesblankaftersomeperiodofcomputer
inactivity.
Action:Thecomputerisprobablysetforenergysavingswiththepower-managementfeature.Ifthe
power-managementfeatureisenabled,disablingitorchangingthesettingsmightsolvetheproblem.
Iftheseactionsdonotcorrecttheproblem,runtheLenovoSolutionCenterprogram.Ifyouneedtechnical
assistance,seeChapter11“Gettinginformation,help,andservice”onpage119.
Themonitorworkswhenyouturnonthecomputer,butgoesblankwhenyoustart
someapplicationprograms
Symptom:Themonitorworkswhenyouturnonthecomputer,butgoesblankwhenyoustartsome
applicationprograms.
Actions:
•Ensurethatthemonitorsignalcableissecurelyconnectedtothemonitorandthemonitorconnectoron
thecomputer.Aloosecablecancauseintermittentproblems.
•Verifythatthenecessarydevicedriversfortheapplicationprogramsareinstalled.Refertothe
documentationfortheaffectedapplicationprogramtoseeifdevicedriversarerequired.
Iftheseactionsdonotcorrecttheproblem,runtheLenovoSolutionCenterprogram.Ifyouneedtechnical
assistance,seeChapter11“Gettinginformation,help,andservice”onpage119
.
Theimageappearstobeickering
Symptom:Theimageappearstobeickering.
Chapter10.Troubleshootinganddiagnostics109
- ThinkCentre 1
- UserGuide 1
- ThirdEdition(September2012) 2
- Contents 3
- Importantsafetyinformation 7
- Powercordsandpoweradapters 8
- Plugsandoutlets 9
- Externaldevices 9
- Heatandproductventilation 9
- Operatingenvironment 10
- Modemsafetyinformation 10
- Lasercompliancestatement 11
- Powersupplystatement 11
- Cleaningandmaintenance 11
- Chapter1.Productoverview 13
- Chapter1.Productoverview3 15
- Specications 17
- Lenovoprograms 17
- Chapter1.Productoverview7 19
- Locations 21
- 10ThinkCentreUserGuide 22
- .Productoverview11 23
- Locatingcomponents 24
- Locatingpartsonthesystemboard 25
- Locatinginternaldrives 26
- Machinetypeandmodellabel 27
- 16ThinkCentreUserGuide 28
- Chapter2.Usingyourcomputer 29
- Usingthekeyboard 30
- UsingWindowsshortcutkeys 30
- Usingangerprintreader 30
- Usingthewheelmouse 31
- Adjustingaudio 31
- Aboutyourcomputeraudio 31
- UsingCDsandDVDs 32
- PlayingaCDorDVD 33
- RecordingaCDorDVD 33
- 22ThinkCentreUserGuide 34
- Chapter3.Youandyourcomputer 35
- Aircirculation 36
- Glareandlighting 36
- Registeringyourcomputer 37
- Voltage-selectionswitch 37
- Replacementpowercords 38
- Chapter4.Security 39
- Lockingthecomputercover 40
- Attachingacablelock 41
- BIOSpasswords 42
- Windowspasswords 43
- Conguringthengerprintreader 43
- Usingandunderstandingrewalls 43
- Protectingdataagainstviruses 43
- 32ThinkCentreUserGuide 44
- Installingorreplacinghardware 45
- Installingexternaloptions 45
- Removingthecomputercover 46
- InstallingorreplacingaPCIcard 47
- 1toopenthecardlatch2 48
- Figure13.RemovingaPCIcard 49
- Figure14.InstallingaPCIcard 50
- Attention: 50
- 1onthememory 52
- Installingthecardreader 55
- Replacingthecardreader 57
- Replacingthebattery 58
- Replacingthemicroprocessor 63
- 54ThinkCentreUserGuide 66
- 1,pin2,pin3 68
- Installingthesolid-statedrive 69
- Replacingthefrontfanassembly 71
- Replacingtherearfanassembly 72
- Replacingtheinternalspeaker 75
- Replacingthethermalsensor 77
- 66ThinkCentreUserGuide 78
- 68ThinkCentreUserGuide 80
- ReplacingtheWiFiunits 81
- RemovingtheWiFiadaptercard 82
- RemovingtheWiFicardmodule 83
- InstallingtheWiFiunits 84
- InstallingtherearWiFiantenna 87
- RemovingtherearWiFiantenna 87
- InstallingthefrontWiFiantenna 88
- Replacingthekeyboardormouse 90
- Completingthepartsreplacement 91
- Obtainingdevicedrivers 92
- Chapter6.Recoveryinformation 93
- Creatingrecoverymedia 94
- Usingrecoverymedia 94
- Performingabackupoperation 94
- Performingarecoveryoperation 95
- Creatingandusingarescuemedium 96
- Reinstallingsoftwareprograms 98
- Reinstallingdevicedrivers 98
- Solvingrecoveryproblems 98
- 88ThinkCentreUserGuide 100
- Viewingandchangingsettings 101
- Usingpasswords 101
- AdministratorPassword 102
- HardDiskPassword 102
- Passwordconsiderations 102
- Power-OnPassword 102
- Enablingordisablingadevice 103
- Selectingastartupdevice 104
- EnablingErPcompliancemode 104
- ICEperformancemode 105
- ICEthermalalert 105
- ExitingtheSetupUtilityprogram 106
- Usingsystemprograms 107
- ThinkCentreUserGuide 108
- Chapter9.Preventingproblems 109
- UsingSystemUpdate 110
- Cleaningyourcomputer 111
- Goodmaintenancepractices 112
- Movingyourcomputer 112
- Basictroubleshooting 113
- Troubleshootingprocedure 114
- Troubleshooting 114
- Audioproblems 115
- CDproblems 116
- DVDproblems 117
- DVDmoviewillnotplay 118
- Playbackisverysloworchoppy 118
- Intermittentproblems 119
- Monitorproblems 121
- Networkingproblems 122
- Ethernetproblems 123
- AwirelessLANproblem 124
- AwirelessWANproblem 124
- Optionproblems 125
- Performanceandlockupproblems 126
- Printerproblems 127
- Serialportproblems 128
- Softwareproblems 128
- USBproblems 129
- LenovoSolutionCenter 130
- ©CopyrightLenovo2012 131
- LenovoSupportWebsite 132
- Helpandservice 132
- Callingforservice 132
- Usingotherservices 133
- Purchasingadditionalservices 133
- 122ThinkCentreUserGuide 134
- AppendixA.Notices 135
- Trademarks 136
- Exportclassicationnotice 137
- Electronicemissionsnotices 137
- 128ThinkCentreUserGuide 140
- ImportantWEEEinformation 141
- Recyclinginformation 141
- RecyclinginformationforBrazil 142
- 132ThinkCentreUserGuide 144
- ChinaRoHS 145
- TurkishRoHS 145
- UkraineRoHS 145
- IndiaRoHS 146
- 136ThinkCentreUserGuide 148
- 138ThinkCentreUserGuide 150
- 140ThinkCentreUserGuide 152
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