Lenovo ThinkPad Edge E520 - Errors Without Messages

Solution:Thethermalsensorisnotfunctioningcorrectly.Havethecomputerserviced.
Devicenotfound
Checkthedeviceyouwanttobootfrom.
Deviceerror
Checkthedeviceyouwanttobootfrom.
Novalidoperatingsystem
Checkthattheoperatingsystemhasnofailureandisinstalledcorrectly.
Excludedfrombootorder
OpentheThinkPadSetupandaddthedevicetobootorder.
Errorswithoutmessages
•Problem:MyscreenkeepsblankingwhenIdonotwantitto.
Solution:Youcandisableanysystemtimers,suchastheLCDturn-offtimerortheblanktimer
1.StartPowerManager.
2.ClickthePowerplantab(inWindowsXP ,Powerscheme),andthenselectMaximumPerformance
fromthepredenedpowerplans(inWindowsXP ,Powerscheme).
•Problem:WhenIturnonthemachine,nothingappearsonthescreenandthemachinedoesnotbeep
whilestartingup.
Note:Ifyouarenotsurewhetheryouheardanybeeps,turnoffthecomputerbypressingandholding
thepowerswitchfor4secondsormore.Turnitonandlistenagain.
Solution:Makesurethat:
–Thebatteryisinstalledcorrectly.
–Theacpoweradapterisconnectedtothecomputerandthepowercordispluggedintoaworking
electricaloutlet.
–Thecomputeristurnedon.(Turnthepowerswitchonagainforconrmation.)
Ifapower-onpasswordisset:
–Pressanykeytodisplaythepromptforthepower-onpassword.Ifthebrightnesslevelofthescreenis
low,increaseitbypressingtheHome.
–TypethecorrectpasswordandpressEnter(refertoPower-onpassword).
Iftheseitemsareproperlyset,andthescreenremainsblank,havethecomputerserviced.
•Problem:WhenIturnonthemachine,onlyawhitecursorappearsonablankscreen.
Solution:Ifyouhavemodiedapartitiononyourharddiskdrivebyusingapartitionsoftware,information
aboutthatpartition,orthemasterbootrecordmayhavebeendestroyed.
1.Turnoffthecomputer,andthenturnitonagain.
2.Ifyoustillseeonlythecursoronthescreen,dothefollowing:
–Ifyouhaveusedthepartitionsoftware,examinethepartitionontheharddiskdrivebyusingthe
software,andrecoverthepartitionifrequired.
–UseeithertheRescueandRecoveryworkspaceortherecoverydiscstorestorethesystemto
thefactorystate.Fordetailsaboutrestoringthesystemtothefactorystate,see“Creatingand
usingrecoverymedia”onpage69
.
Iftheproblempersists,havethecomputerserviced.
•Problem:Myscreengoesblankwhilethecomputerison.
Chapter10.Troubleshootingcomputerproblems137