Cuando tienes un problema con la instalacion de MAC OS y no encuentra el disco duro hay que hacer los siguientes pasos:

  1. Turn off the computer,
  2. Hold down “Command”, “Option”, “P” and “R” on the keyboard,
  3. Turn on the computer,
  4. Keep holding down the keys until the computer restarts itself again (maybe ten or fifteen seconds at most),
  5. Release the keys after the computer has restarted again.
From here you should be able to proceed with the installation of Lion with no further problems.

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