Manual

42 Chapter 3 Problem, Meet Solution
If your MacBook Air doesn’t turn on or start up
TrythefollowingsuggestionsinorderuntilyourMacBookAirturnson:
Â MakesurethepoweradapterispluggedintoyourMacBookAirandintoa
functioningpoweroutlet.Besuretousethe45WMagSafePowerAdapterthatcame
withyourMacBookAir.Ifthepoweradapterstopschargingandyoudon’tseethe
indicatorlightonthepoweradapterturnonwhenyoupluginthepowercord,try
unpluggingandrepluggingthepowercordtoreseatit.
Â Checkwhetherthebatteryneedstoberecharged.Ifthelightonthepoweradapter
glowsamber,thebatteryischarging.See“ChargingtheBattery”onpage34.
Â Iftheproblempersists,resettheMacBookAirpowermanager(whilestillpreserving
yourles)bypressingtheleftShiftkey,leftOptionkey,leftControlkey,andthe
power(®)buttonsimultaneouslyforvesecondsuntilyourMacBookAirrestarts.
Â Pressandreleasethepower(®)buttonandimmediatelyholddowntheCommand
(x),Option,P,andRkeyssimultaneouslyuntilyouhearthestartupsoundasecond
time.ThisresetstheparameterRAM(PRAM).
Â Ifyoustillcan’tstartupyourMacBookAir,see“LearningMore,Service,andSupport”
onpage50forinformationaboutcontactingAppleforservice.
If the screen suddenly goes black or your MacBook Air freezes
TryrestartingyourMacBookAir.
1 UnpluganydevicesthatareconnectedtoyourMacBookAir,exceptthepoweradapter.
2 Pressthepower(®)buttontorestartthesystem.
3 Letthebatterychargetoatleast10percentbeforeplugginginanyexternaldevices
andresumingyourwork.