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Model A1369, 1.6, 1.7, or 1.8 GHz Processor, 64, 128 or 256GB Flash Storage

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My MacBook wont boot after update

I bought a MacBook Air A1369 with OS-X Yosemite, I started update but after rebooting the system was blocked on the charging bar, I let it for for more than 8 hours and no result!!! I retried to reinstall Yosemite but same result again, the fan is working non stop,

I tried to boot up the MacBook Air using my MacBook Pro's internal HD as external drive (Target Disk Mode), it boots but it takes a long time to boot or to start an app.

Answer this question I have this problem too

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How are you connecting your systems together using Target Disk Mode? USB or Thunderbolt? If you are using USB that could be the issue as you only have USB2 in your MacBook Air.

Does the fan stop running fast when you are in target disk mode?

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thank you for your answear, i tried diagnostic mode but it seems that everything is ok and don't shows anything of wrong. is there another way to start target mode using wifi or ethernet cable because in my city i didn't fint a firewire cable and no thunderbolt ports on my macbooks

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Your limited here on what your system has for ports. Your MacBook Air only has USB and Thunderbolt. If your MAcBook doesn't have a Thunderbolt port see if you can find a friend who has a Mac system which does. As for the cable you may need to order it and wait until it comes if you don't want to have your system tied up for so long.

Even still you can use the USB connection its just slow. Backup anything important and redo the drive via Target Disk Mode.

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You might want to the onboard diagnostics to check things out. Hold the D key when you boot up the MacBook Air.

You could do the reverse! Boot up your MacBook Air in Target Disk Mode then use your MacBook Pro to reformat the Air's SSD drive using Disk Utility as well as install a fresh OS on it from your MacBook. The Trick is to make sure you select the Air's drive. You may want to rename the Airs drive before you do the install so you don't get confused if you have the default name Apple uses on your systems.

To speed things up I would interconnect the systems using a Thunderbolt cable.

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