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  1. #1

    Member Since
    Feb 17, 2012
    Question Macbook OS will not start
    i have a three year old macbook..
    when i try to start the machine a grey circle with a line thru it comes on the screen...
    the whirling disk keeps whirling but the OS does not start..
    anyone know which buttons to press on startup to fix this problem?

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Nambucca Heads Australia
    iMac i5 2.7GHz, 16GB memory, OS 10.11.1.
    G'day and welcome to the forums.

    Try zapping the PRAM, boot and hold down Command, Option P and R keys all at the same time immediately after the chime, and keep held down until you hear the third chime.

    No joy boot from your system disc and run repair Disk from there as you may have a failing hard drive.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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