Lenovo ThinkPad Edge E520 - A Power Button Problem; Startup Problems

g.Waitfor30seconds,andthenreinstalltheSO-DIMMandtheknowngoodbatteryortheacpower
adaptertotestthecomputerwithminimaldevicesattachedrst.
h.Reinstalleachdeviceoneatatimethatyouhaveremovedintheearliersteps.
Ifyourcomputerdoesnotrunonbatterypower,checkthefollowingitems:
1.Removeandreseatthebatterytomakesurethatitisproperlyconnected.Referto“Replacingthe
battery”onpage77
.
2.Swapbatterieswithanothersimilarmodel,ifavailable.
IfanothersimilarThinkPadmodelisavailable,thenverifythatthebatterypackworksintheother
computerandthatthebatterypackfortheothermodelworksinthiscomputer.
3.Verifythebattery-statusindicator.Referto“Power-statusindicators”onpage13.
Apowerbuttonproblem
•Problem:Thesystemdoesnotrespond,andyoucannotturnoffthecomputer.
Solution:Turnoffthecomputerbypressingandholdingthepowerbuttonfor4secondsormore.Ifthe
systemisstillnotreset,removetheacpoweradapterandthebattery.
Startupproblems
Printtheseinstructionsnowandkeepthemwithyourcomputerforreferencelater.
Ifyoureceiveanerrormessagebeforetheoperatingsystemloads,checkthefollowingitem:
•FollowtheappropriatecorrectiveactionsforPower-onself-testerrormessages.
Ifyoureceiveanerrormessagewhiletheoperatingsystemisloadingthedesktopcongurationafterthe
POSTiscompleted,checkthefollowingitems:
1.VisittheLenovoSupportWebsiteathttp://www.lenovo.com/supportandsearchfortheerrormessage.
2.VisittheMicrosoftKnowledgeBasehomepageathttp://support.microsoft.com/andsearchforthe
errormessage.
Sleep(standby)andhibernationproblems
•Problem:Thecomputerenterssleep(standby)modeunexpectedly.
Solution:Iftheprocessoroverheats,thecomputerautomaticallyentersleep(standby)modetoallow
thecomputertocoolandtoprotecttheprocessorandotherinternalcomponents.Checkthesettings
forsleep(standby)mode,usingPowerManager.
•Problem:Thecomputerenterssleep(standby)mode(thesleep/standbyindicatorturnson)immediately
afterPower-onself-test.
Solution:Makesurethat:
–Thebatteryischarged.
–Theoperatingtemperatureiswithintheacceptablerange.Referto“Features”onpage15
,
“Specications”onpage18,and“Operatingenvironment”onpage19.
Ifthebatteryischargedandthetemperatureiswithinrange,havethecomputerserviced.
•Problem:The“criticallow-batteryerror”messageappears,andthecomputerimmediatelyturnsoff.
Solution:Thebatterypowerisgettinglow.Connecttheacpoweradaptertothecomputerandplugit
intoanelectricaloutlet,orreplacethebatterywithachargedone.
•Problem:ThecomputerdisplayremainsblankafteryoupressFntoreturnfromsleep(standby)mode.
Chapter10.Troubleshootingcomputerproblems153