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Is it possible to delete everything from my Mac and then install OS X from a bootable USB? I don't why but somehow AudioAUUC extension was modified a few months ago and my sound isn't working since then. That's why I would like remove everything and install a fresh OS X.

  • You could also boot from the recovery partition and delete and reinstall the OS – Mark Jun 5 '15 at 14:56
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You don't necessarily have to remove everything to repair OS X

Depending on OS X version you can just reboot holding the R key, to boot into the recovery partition. Alternatively you can hold alt/option to display current boot options and select your recovery partition.

Once in the recovery partition, you can use Disk Utility to erase your OS X partition if you want to wipe everything, or you can just select "Reinstall OS X" from the main menu. This will reinstall OS X system files and leave your home directory, settings, documents, etc alone. I'd recommend trying just the reinstall of OS X first, and if this doesn't work to fix your issue, proceed to erase your OS X partition and then reinstall OS X.

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  1. Make a backup of your files/settings

  2. Boot into the OS X Installer

    If you need to create a bootable USB installer, see the Apple KB article

  3. Open Disk Utility and erase the disk

  4. Use the OS X Installer to install OS X

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