How to reinstall OS X and backup data?

Discussion in 'MacBook Air' started by gcruz, Jan 19, 2011.

  1. gcruz macrumors newbie

    Jan 19, 2011
    I´m having hard times with my MBAir (old model, only one usb port). If you could help I´d appreciate it. Thanks in advance!

    Symptoms: The MBA doesn´t turn on. When I push the power button, the led light appears, the screen goes grey with the apple (as normal) and after 8-10 seconds, puff... it goes off.

    Diagnosis (via Mac´s Genius Bar): The hardware is fine, the data is there, the OS X is corrupt

    How to fix it: Reinstall the OS X

    My main problem: I need to do the backup of the data (very important) and reinstalling the OS X deletes the internal HD completely

    So, what I´ve been told:
    1. Install the OS X on an external HD;
    2. Power on the MBA, running the OS from the external HD;
    3. Save the data;
    4. Reinstall the OS X in the MBA

    Seems easy, but it´s not:
    Question 1. How do I install the OS X on an extHD, having 2 separate CDs, from a PC?
    Question 2. Does it (the extHD) needs to be formatted?

    Any further tips are extremely valuable! Thanks**
  2. Damo01 macrumors regular

    Feb 11, 2010
    Not easy but Genius should have told you this.

    Do you have external CD/DVD drive that you can boot from?

    hold down the alt/option key on the keyboard as soon as press the power button. A boot selector screen should come up giving you choice to boot off from.

    Insert your Mac OS X DVD and it should appear in the boot selector screen boot selector screen. Select your DVD and it should boot off from your mac OS DVD.

    You should be able to rest. but this should get you started.

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