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Operating System won’t boot

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If the hardware appears to be ok, here are some steps to try to resolve OS problems:

  1. Hold down the shift key while booting the computer; this is similar to Windows Safe Mode boot.
  2. Try booting into single-user mode:
    1. Hold down Command-S while booting the computer
    2. type in: "fsck -fy"
    3. type in: "mount -uw"
    4. type in: "chown root:admin /"
    5. type in: "reboot"
Operating System won’t boot