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(From OS X Daily) You'll need an 8 GB or larger USB Drive. Remember, it will be erased, so backup any important files. Use the following command in Terminal (assuming the Install OS X El Capitan app is in /Applications, which where the App Store installs it by default) Also make note of the USB Volume Label and use its name in the command below in place ...


You need to press and hold the key(s) immediately after you turn on your Mac and hear the startup sound. Keep holding until the described behavior occurs. To Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media), press and hold the C key. Or try using the Startup Manager to see if the DVD is available as a boot device, press and ...

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