Reset NVRAM. Release the keys after you hear the startup sound again.
Command-S is for 'single-user mode,' which essentially means booting to the. Start up from OS X Recovery over the Internet. Shift key, for instance, starts your Mac in Safe mode, and C (or c) starts up from a bootable CD, DVD, or thumb drive. You can specify other modulus sizes with the modulus keyword. If the modulus is not specified, the default key modulus of 1024 is used. Start up from a NetBoot server using the default boot image. If you do not use additional keywords this command generates one general purpose RSA key pair. 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.
Mac command key purpose install#
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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