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Chapter4.GeneralCheckout

Attention

Thedrivesinthecomputeryouareservicingmighthavebeenrearrangedorthedrivestartupsequence

changed.Beextremelycarefulduringwriteoperationssuchascopying,saving,orformatting.Dataor

programscanbeoverwrittenifyouselectanincorrectdrive.

Generalerrormessagesappearifaproblemorconictisfoundbyanapplicationprogram,theoperating

system,orboth.Foranexplanationofthesemessages,refertotheinformationsuppliedwiththatsoftware

package.

Notes:

•Thedefaultisforthiscomputertobootupinquietmode(nobeep,nomemorycountandcheckpointcode

display)whennoerrorsaredetectedbyPOST.

•Toenablebeep,memorycount,andcheckpointcodedisplaywhenasuccessfulPOSToccurs,dothefollowing:

1.StarttheSetupUtilityprogram.See“StartingtheSetupUtilityprogram”onpage47.

2.SelectStartOptions.

3.SetPower-OnSelf-TesttoEnhanced.

•BeforereplacinganyFRUs,ensurethatthelatestlevelofBIOSisinstalledonthesystem.Adown-levelBIOSmight

causefalseerrorsandunnecessaryreplacementofthesystemboard.Formoreinformationonhowtodetermine

andobtainthelatestlevelBIOS,see“BIOSlevels”onpage375

Usethefollowingproceduretohelpdeterminethecauseoftheproblem:

1.Power-offthecomputerandallexternaldevices.

2.Checkallcablesandpowercords.

3.Setalldisplaycontrolstothemiddleposition.

4.Power-onallexternaldevices.

5.Power-onthecomputer.

•Lookfordisplayederrorcodes

•Listenforbeepcodes

•Lookforreadableinstructionsoramainmenuonthedisplay.

Ifyoudidnotreceivethecorrectresponse,proceedtostep6onpage37.

Ifyoudoreceivethecorrectresponse,proceedtostep8onpage38

6.Lookatthefollowingconditionsandfollowtheinstructions:

•IfyouhearbeepcodesduringPOST,goto“Beepsymptoms”onpage70

•IfthecomputerdisplaysaPOSTerror,goto“POSTerrorcodes”onpage72.

•Ifthecomputerhangsandnoerrorisdisplayed,continueatstep7onpage37

7.TherearethreeLEDstohelpyoudetermineifthepowersupplyandsystemboardareworkingcorrectly.

ApowerbuttonLEDislocatedonthefrontofthecomputerandtwodiagnosticLEDsarelocatedonthe

powersupplyattherearofthecomputer.

a.Disconnectthepowercordfromtheelectricaloutlet.

b.Reconnectthepowercordtoaworkingelectricaloutlet.

c.Pressthepowerbutton.

d.ObservetheLEDsandrefertothefollowingtable.

Lenovo ThinkCentre M55p Hardware Maintenance Manual

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