How to Boot an iMac From the CD-ROM Drive


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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