ThinkPad T420 - Restoring Factory Contents Using Recovery Disc Set

1.Turnonthecomputer.Ifthecomputercannotbeturnedon,goto“Powersystemcheckout”onpage37,
andcheckthepowersources.Ifanerrorcodeisdisplayed,goto“Symptom-to-FRUindex”onpage47
forerrorcodedescriptionsandtroubleshootinghints.
2.WhentheThinkPadlogoisdisplayed,repeatedlypressandreleasetheF12key.WhentheBootMenu
windowopens,releasetheF12key.
3.PresstheTabkeytoswitchtotheApplicationMenuwindow.
4.UsethearrowkeystoselectLenovoDiagnosticsandthenpressEnter.ThemainscreenoftheUEFI
diagnosticprogramisdisplayed.
5.Followtheinstructionsonthescreentousethediagnosticprogram.
Theoptionsonthemainscreenareasfollows:
TestsTools
•QuickMemoryTest
•QuickStorageDeviceTest
•ExitApplication
•SystemInformation
•RecoverBadSectorsTool
Bootablediagnosticprograms
IfthecomputeryouareservicingisnotinstalledwiththeUEFIdiagnosticprogram,youcandownloada
bootablediagnosticprogramfromtheLenovoSupportWebsite.Thebootablediagnosticprogramsenable
youtotestcomputermemoryandinternalstoragedevices,viewsysteminformation,andcheckandrecover
theinternalstoragedevices.Tousethebootablediagnosticprograms,youcancreateabootablediagnostic
mediumonaUSBdeviceorCD.
Tocreateabootablediagnosticmedium,dothefollowing:
1.Gotohttp://www.lenovo.com/diags.
2.ClickLenovoBootableDiagnostics.
3.FollowtheinstructionsontheWebsitetocreateabootablediagnosticmediumonaUSBdeviceorCD.
Tousethediagnosticmediumyouhavecreated,dooneofthefollowing:
•IfyouhavecreatedthebootablediagnosticmediumonaUSBdevice,dothefollowing:
1.AttachtheUSBdevicetothecomputer.
2.Turnonthecomputer.Ifthecomputercannotbeturnedon,goto“Powersystemcheckout”onpage
37
,andcheckthepowersources.Ifanerrorcodeisdisplayed,goto“Symptom-to-FRUindex”on
page47forerrorcodedescriptionsandtroubleshootinghints.
3.WhentheThinkPadlogoisdisplayed,repeatedlypressandreleasetheF12key.WhentheBoot
Menuwindowopens,releasetheF12key.
4.UsethearrowkeystoselectUSBHDDandthenpressEnter.Thediagnosticprogramwillbe
launchedautomatically.
5.Followtheinstructionsonthescreentousethediagnosticprogram.
•IfyouhavecreatedthebootablediagnosticmediumonaCD,dothefollowing:
1.Turnonthecomputer.Ifthecomputercannotbeturnedon,goto“Powersystemcheckout”onpage
37,andcheckthepowersources.Ifanerrorcodeisdisplayed,goto“Symptom-to-FRUindex”on
page47forerrorcodedescriptionsandtroubleshootinghints.
2.InserttheCDintotheopticaldrive.
3.Restartthecomputer.
4.WhentheThinkPadlogoisdisplayed,repeatedlypressandreleasetheF12key.WhentheBoot
Menuwindowopens,releasetheF12key.
Chapter3.Generalcheckout35
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