This mode allows you to fix problems with a Mac that refuses to start. The clue here is in the name. Instead, Verbose mode is perfect for those instances when your Mac hangs on boot. You can see exactly what is interrupting the boot process, and hopefully take steps to remedy it. For example, many boot problems are related to third-party kernel extensions.
Verbose mode may highlight the problem extension, allowing you to reboot in Safe mode, remove the offending item, then boot as normal and try again.
Is your Mac old enough to have an optical drive? Holding C while your computer boots forces macOS to ignore your startup volume in favor of bootable optical media instead. Trying to boot from the wrong optical volume? This allows companies to customize macOS to their liking and create custom images for specific users, then deploy it network-wide without modifying every machine.
1. Press C During Startup
If you have set your Mac to login automatically, you can tell it to ignore this setting by holding Left Shift after the boot screen a white Apple logo and progress bar appears. Want to stop all your login items and previous session windows from opening on launch? When you get to the login screen, enter your password as normal then click on the Log In button or hit Enter. Immediately press and hold the Shift key while your Mac logs in and boots up. Read More , and we recommend that you learn them now so you can rely on them when you really need them.
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7 Mac Startup Options Every OS X User Should Know
Other company and product names may be trademarks of their respective owners. How to select a different startup disk If you have another startup disk with a compatible operating system, your Mac can start up from that disk instead of your current startup disk.
Use Startup Disk preferences When you use Startup Disk preferences to select a startup disk, your Mac starts up from that disk until you choose a different one. Select your startup disk, then restart your Mac. Press and hold the Option key immediately after turning on or restarting your Mac. If your Mac is protected by a firmware password , you can release the key when you're asked to enter the password.
Select your startup disk, then click the arrow under its icon, or press Return. If you press and hold the Control key during this step, your selection is saved in Startup Disk preferences, so it persists until you change it. If you can't select your startup disk or start up from it Check for these possibilities if you can't see your disk in Startup Disk preferences or Startup Manager, or your Mac won't start up from it.
Open the Terminal app, which is in the Utilities folder of your Applications folder.