#Mac os x startup disk has no more space mac os x#
Reset NVRAM. Release the keys after you hear the startup sound again. Although you can change the startup disk from the System Preferences window in Mac OS X 10.9 Mavericks, there are times when you may need to change it from the Terminal. So, it is not too complicated to Mac boot from CD/DVD. This will start the OS X installer from the CD/DVD on your Mac. When the startup music is playing press and hold the C key from the keyboard. Start up from OS X Recovery over the Internet. Open your Mac or restart the device if you were already using it. Start up from a NetBoot server using the default boot image.
Start up from a compatible NetBoot server. Start up to either Apple Hardware Test or Apple Diagnostics over the Internet. Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you're using. Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media). The links below point to other support documents on Apple's website. I'm betting many of you don't know them all, either, so here they are. I was personally familiar with these and several others, but it turns out there are 15 total combinations, thanks to a KnowledgeBase article Apple posted.
Command-S is for "single-user mode," which essentially means booting to the command line. Shift key, for instance, starts your Mac in Safe mode, and C (or c) starts up from a bootable CD, DVD, or thumb drive. Your Mac and OS X have a variety of startup keys and key combinations you can use to affect how the device starts up.
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