This is great for those times when your main installation of OS X isnt working correctly and you need to boot into a bootable mirror of your OS X install. You can use the mouse or the keyboard to select a device to boot into. Press Option During Startup Holding down the Option key during startup will show you a boot screen with all bootable devices listed. Hold the keys down until the computer restarts and you hear the startup sound for the second time. To do this, youll want to turn off your Mac, and then turn it back on while holding down the Command Option P R keys. These two memory areas store settings and information that is not cleared whenever you turn off your Macs power. Press Option Command P R Sometimes on a Mac, the PRAM (parameter RAM) and NVRAM (non-volatile RAM) can become corrupt and cause various problems. With the introduction of Intel-based Macs, however, Apple has built the AHT utility right into your Mac. Press D During Startup Apples Hardware Test utility is usually run by booting from a disc that came with your computer.
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Press C During Startup Booting from a CD You can hold down the C key on your keyboard to instantly boot to a Mac OS X or other bootable disc in your Mac. Sometimes, launching your Mac this way can help save you a trip to the Apple Store. Clean Option For Eclipse On Software Preventing Your.