Manual

44 Chapter 3 Problem, Meet Solution
Using Apple Hardware Test
IfyoususpectaproblemwiththeMacBookAirhardware,youcanusetheApple
HardwareTestapplicationtohelpdetermineifthere’saproblemwithoneofthe
components,suchasthememoryorprocessor.
To use Apple Hardware Test on your MacBook Air:
1 DisconnectallexternaldevicesfromyourMacBookAirexceptthepoweradapter.
2 RestartyourMacBookAirwhileholdingdowntheDkey.
3 WhentheAppleHardwareTestchooserscreenappears,selectthelanguageyouwant
touse.
4 PresstheReturnkeyorclicktherightarrowbutton.
5 WhentheAppleHardwareTestmainscreenappears(afterabout45seconds),follow
theonscreeninstructions.
6 IfAppleHardwareTestdetectsaproblem,itdisplaysanerrorcode.Makeanoteofthe
errorcodebeforepursuingsupportoptions.IfAppleHardwareTestdoesn’tdetecta
hardwarefailure,theproblemmaybesoftwarerelated.
If this procedure doesn’t work, you can open Apple Hardware Test using the USB
ash drive that came with your MacBook Air:
1 InserttheSoftwareReinstallDriveintooneoftheUSBports,asshowninthe
illustrationonpage48.
Important: Don’tdisturborremovetheSoftwareReinstallDriveuntilyounish.
2 RestarttheMacBookAirwhileholdingdowntheDkey.