Repairing EFI On Macbook

Discussion in 'Mac Basics and Help' started by Gizmo22, Oct 2, 2011.

  1. Gizmo22 macrumors regular

    Gizmo22

    Joined:
    Oct 22, 2009
    Location:
    Midwest USA
    #1
    Debating purchasing a used Macbook that "has a screwed up EFI bootloader." The individual claims to have "messed up EFI" by installing other operating systems on the drive.

    I am not terribly fluent with EFI versus older bootloaders as I am recently coming from a Windows system. Nevertheless, is anything needed other than a simple reformat, or is EFI embedded in CMOS circuitry or elsewhere?
     
  2. Quad5Ny macrumors 6502a

    Quad5Ny

    Joined:
    Sep 13, 2009
    Location:
    New York, USA
    #2
    Just installing another OS will not do anything to the UEFI, the seller sounds like he doesn't know what he's is taking about.

    Wiping the Hard drive and reinstalling OS X will probably be all that's needed.
     
  3. ppc_michael Guest

    ppc_michael

    Joined:
    Apr 26, 2005
    Location:
    Los Angeles, CA
    #3
    Check out rEFIt, an EFI boot menu that you can boot from a CD or copy it to your Mac OS X hard drive.
     
  4. Nermal Moderator

    Nermal

    Staff Member

    Joined:
    Dec 7, 2002
    Location:
    New Zealand
  5. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #5
    The quoted answer above is correct. Just reinstall Mac OS X and it'll work just fine.
     

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