Boltronic Mac OS

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These key combinations apply only to Mac computers with an Intel processor, not Mac computers with Apple silicon.

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Note: The headings on this list indicate the Macintosh System bundle names; the bullet points indicate the version of the System File included in that bundle. This is to make it clearer for people searching for specific bundle versions as opposed to System File versions. Finder File versions are not indicated. 1 Classic Mac OS 1.1 Macintosh System Software (0 - 0.3) 1.1.1 System File 1 1.1.2. MacBooster 8 scans every corner of your Mac and safely removes unnecessary files including 20 different types of junk listed below. Free up your Mac hard disk and give your more space to run your Mac smoothly. This is particularly helpful for Mac users with smaller SSD hard disks.

To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Keep holding until the described behavior occurs.

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  • Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're prompted to enter the password.
  • Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password.
  • Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
  • Shift (⇧): Start up in safe mode. Disabled when using a firmware password.
  • D: Start up to the Apple Diagnostics utility. Or use Option-Dto start up to this utility over the Internet. Disabled when using a firmware password.
  • N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead. Disabled when using a firmware password.
  • Command-S: Start up in single-user mode. Disabled in macOS Mojave or later, or when using a firmware password.
  • T: Start up in target disk mode. Disabled when using a firmware password.
  • Command-V: Start up in verbose mode. Disabled when using a firmware password.
  • Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc. Disabled when using a firmware password.

If a key combination doesn't work

If a key combination doesn't work at startup, one of these solutions might help:

  • Press and hold all keys in the combination together, not one at a time.
  • Shut down your Mac. Then press the power button to turn on your Mac. Then press and hold the keys as your Mac starts up.
  • Wait a few seconds before pressing the keys, to give your Mac more time to recognize the keyboard as it starts up. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use.
  • If you're using a wireless keyboard, plug it into your Mac, if possible. Or use your built-in keyboard or a wired keyboard. If you're using a keyboard made for a PC, such as a keyboard with a Windows logo, try a keyboard made for Mac.
  • If you're using Boot Camp to start up from Microsoft Windows, set Startup Disk preferences to start up from macOS instead. Then shut down or restart and try again.

Remember that some key combinations are disabled when your Mac is using a firmware password.

Learn more

  • Keyboard shortcuts that you can use after your Mac has started up.

Clean up Gigabytes of Junk

MacBooster 8 scans every corner of your Mac and safely removes unnecessary files including 20 different types of junk listed below. Free up your Mac hard disk and give your more space to run your Mac smoothly. This is particularly helpful for Mac users with smaller SSD hard disks. Learn more >

Boost your Mac to peak performance

Mac gets slower and slower due to Mac disk issues. MacBooster 8 can optimize Mac hard disk and fix disk permission issues. Make sure your disk will always be the excellent status and boost your Mac to peak performance. Learn more >

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Memory Clean to Speed Up Mac

Mac can slow down as more stuff is running in the system and the RAM is cluttering up. By using MacBooster 8 Memory Clean App, you can choose to close those apps taking up the memory and free up inactive memory for other tasks. Learn more >

MacBooster Mini Comes with Powerful functions

The MacBooster Mini, which is standing by at the menu bar, offers more than what you can imagine. It shows you the usage of the memory and the status of network and firewall. At the same time, it offers you one click to clean memory, Cache, trash and optimize DNS. With the Lightning Booster mode, it can provide you with a faster online surfing experience.

More Amazing Tools Available

Startup Optimization

Manage your startup items to increase OS X boot speed

Performance Boost

Optimize your Mac and offer the fast speed

Large Files Cleaner

Find and remove large files for more space

Uninstaller

Remove unwanted apps with just one click

Memory Clean

Clean Mac memory to speed up

Duplicates Finder

Locate and smartly delete duplicates on Mac

User Review

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I’ve been using ASC for a number of years on my PC - and I missed it when I changed to MAC. But now I’m back on track again using a tool giving the optimal conditions run my MAC.

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Finally Advanced SystemCare is here on OS X as MacBooster, so we can keep our systems optimised and clean.