User Guide
Page 44
... For more information about Apple Hardware Test, see the Apple Hardware Test Read Me file on your MacBook Air: 1 Disconnect all external devices from your computer except the power adapter. 2 Restart your MacBook Air while holding down the D key. 3 When the Apple Hardware Test chooser screen ...components, such as the memory or processor. If Apple Hardware Test doesn't detect a hardware failure, the problem may be software related. To use the Apple Hardware Test application to help determine if there's a problem with the MacBook Air hardware, you can use Apple Hardware Test on the Mac OS...
... For more information about Apple Hardware Test, see the Apple Hardware Test Read Me file on your MacBook Air: 1 Disconnect all external devices from your computer except the power adapter. 2 Restart your MacBook Air while holding down the D key. 3 When the Apple Hardware Test chooser screen ...components, such as the memory or processor. If Apple Hardware Test doesn't detect a hardware failure, the problem may be software related. To use the Apple Hardware Test application to help determine if there's a problem with the MacBook Air hardware, you can use Apple Hardware Test on the Mac OS...