Time Machine is the easiest way to back up your data if you don't already have another system in place. Second, make sure you have enough free disk space to properly run a secondary operating system. Shoot for at least 30GB free, though I recommend closer to 50GB if you have it available. Boom 3D macOS is a tool meant to help you boost the Mac's sound volume and improve the audio quality. This award-winning pro audio enhancement app empower you to play your media content with incredible 3D effects on ANY headphones, from any player, any media or streaming services. A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use. Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
A prohibitory symbol, which looks like a circle with a line or slash through it, means that your startup disk contains a Mac operating system, but it's not a version or build of macOS that your Mac can use.
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- Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off.
- Turn on your Mac and immediately press and hold both Command (⌘) and R to start up from macOS Recovery.
- While in macOS Recovery, use Disk Utility to repair your startup disk.
- If Disk Utility found no errors or repaired all errors, reinstall macOS.
- If you still need help, please contact Apple Support.
