A keyboard shortcut command allows you to boot up your iMac from a CD in your optical drive rather than loading the operating system stored on your hard drive. This procedure is sometimes required if you need to run CD-based programs or tools, or if you want to reinstall your operating system using MAC OS CD media.
Insert the CD that you want to boot up from and shut down your iMac.
Power on your iMac.
Press the C key on your keyboard quickly as your computer starts up.
Tips & Warnings
- Apple recommend pressing the C key immediately after you hear the start-up sound.
- If you don't press the key quickly enough and your iMac begins to boot up normally, shut down and repeat the process again.
- Photo Credit Justin Sullivan/Getty Images News/Getty Images
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