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1) In the Apple menu, choose Restart or power on your Mac.

2) As the computer restarts, hold down the Command (⌘) – Option (⌥) – R combination immediately upon hearing the startup chime.

Hold the keys until the animated globe appears on the screen. “Starting Internet Recovery,” the message reads. ”This may take a while.”

3) Select your method of Internet connection and wait wil Internet Recover downloads.

4) Use Disk Utility to format and partition the drive, then reinstall OS X fresh.

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