Lenovo B490 - AC power adapter and startup problems; Sleep mode and screen issues

Thebatterypackcannotbecharged.
Youcannotchargethebatterywhenitistoohot.Ifthebatteryfeelshot,removeitfromthecomputerand
allowittocooltoroomtemperature.Afteritcools,reinstallitandrechargethebattery.Ifitstillcannot
becharged,haveitserviced.
Anacpoweradapterproblem
Printtheseinstructionsnowandkeepitwithyourcomputerforreferencelater.
Theacpoweradapterisconnectedtothecomputerandtheworkingelectricaloutlet,butthe
poweradapter(powerplug)iconisnotdisplayedonthetaskbar.Alsotheacpowerindicatordoes
notlightup.
Dothefollowing:
1.Makesurethattheconnectionoftheacpoweradapteriscorrect.Forinstructionsonconnectingtheac
poweradapter,seeSafety,Warranty,andSetupGuidethatcomeswithyourcomputer.
2.Iftheconnectionoftheacpoweradapteriscorrect,turnoffthecomputer,thendisconnecttheacpower
adapterandremovethemainbattery.
3.Reinstallthebatteryandreconnecttheacpoweradapter,thenturnonthecomputer.
4.Ifthepoweradaptericonstillisnotdisplayedonthetaskbarandtheacpowerindicatordoesnotlight
up,havetheacpoweradapterandyourcomputerserviced.
Astartupproblem
Printtheseinstructionsnowandkeepitwithyourcomputerforreferencelater.
TheMicrosoftWindowsoperatingsystemdoesnotstart.
OntheWindowsoperatingsystem,usetherecoveryprogrampreinstalledonyourcomputertohelpsolveor
identifyyourproblem.Fordetails,refertotheinstructionsinChapter6“Recoveryoverview”onpage29.
Sleepandhibernationproblems
Printtheseinstructionsnowandkeepitwithyourcomputerforreferencelater.
Acriticallow-batteryerroroccurs,andthecomputerimmediatelyturnsoff.
Thebatterypowerisgettinglow.Connecttheacpoweradaptertothecomputerandplugitintoanelectrical
outlet,orreplacethebatterywithachargedone.
Thecomputerenterssleepmodeimmediatelyafterthepower-onself-test.
Makesurethat:
•Thebatteryischarged.
•Theoperatingtemperatureiswithintheacceptablerange.refertoChapter8“Preventingproblems”
onpage43
.
Computerscreenproblems
Printtheseinstructionsnowandkeepitwithyourcomputerforreferencelater.
Thescreenisblank.
Doanyofthefollowing:
•Ifyouareusingtheacpoweradapterorusingthebattery,andthebatterystatusindicatorison,press
Fn+uparrowtoincreasethescreenbrightness.
•Ifthepowerindicatorisinblinking,pressthepowerbuttontoresumefromthesleepmode.
48UserGuide