This one may be beneficial if your system is constantly booting into a secondary non-OS X operating system. Holding this key at start-up will force the system to search for a suitable boot volume in the optical drive. When Apple first started using optical media to load the operating system, it only used CD-ROMs, so the "C" key was reserved for commanding the system to boot off the optical drive. To bypass the boot drive, restart the computer and hold the Options-Command-Shift-Delete keys all at once with an alternative boot device connected to the system. If for some reason you cannot boot from an external drive or CD ROM, one method of ensuring the system will not load off the main boot drive by default is to bypass it so it will locate an alternative device to use. However, regardless of the specific problems, there are several steps you can try to either force the system to boot off the main drive or bypass it and select an alternative means of booting for troubleshooting purposes. Other times boot devices may not appear is if there is a problem with either the device, or with the hardware you are using to boot the device.
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There may be times when boot devices are not immediately ready at startup, or where there is a problem such as the inability to read a boot DVD which can prevent booting even when you use the "Startup Disk" utility to select it as the default partition.Īdditionally, while both OS X and the Boot Camp utilities and drivers in Windows will let you select which operating system to restart into, this is not the case with unsupported operating systems such as Linux and Unix. If you have multiple operating systems installed on your computer, or if you are trying to boot off various utility or other boot disks, you may run into problems where using an alternative or desired boot device is not a straightforward process.
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