Boot Up Commands For Mac Os X
Safe mode prevents your Mac from loading certain software as it starts up, including login items, system extensions not required by macOS, and fonts not installed by macOS. It also does a basic check of your startup disk, similar to using First Aid in Disk Utility. And it deletes some system caches, including font caches and the kernel cache, which are automatically created again as needed.
Safe mode is particularly useful when you're trying to resolve an issue that doesn't seem to be associated with using any particular app. As always, keeping your software up to date is the first step toward resolving any software issue.
How to use safe mode
System uptime, the amount of time since a computer’s last boot up, can be an important piece of information for troubleshooting and maintenance purposes, as well as grounds for bragging rights.While Apple has made rebooting OS X far less inconvenient than it used to be with features such as the ability to automatically re-open your last-used apps at login, some Mac owners may be curious. Nov 07, 2014 The boot process will initiate a network boot and seek out any Macs running OS X Server or any Mac that's running a network-based cloning application or service that's broadcasting.
- Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
- Release the key when you see the login window, then log in to your Mac.
- You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.
If the issue continues in safe mode
If the issue continues while in safe mode, or your Mac restarts several times and then shuts down while starting up in safe mode, you should reinstall macOS and make sure that your Apple software and third-party apps are up to date.
If the issue doesn't continue in safe mode
If the issue doesn't continue while in safe mode, leave safe mode by restarting your Mac normally. Then test for the issue again. The issue might be resolved.
If the issue returns after leaving safe mode, startup items are probably at fault. Apps can install such items in numerous places, and they aren't always easy to find or recognize. For that reason, you should first make sure that you've installed any available updates for your Apple software and third-party apps.
If updating your software doesn't help, try any of these solutions: Free antivirus for mac os x 10.9 5 7.
- Unplug all accessories from your Mac, including printers, drives, USB hubs, and other nonessential devices. You could have an issue with one or more of those devices or their cables.
If you still need help, please contact Apple Support.
Learn more
Some features might not work in safe mode, such as movie playback in DVD Player, video capture, file sharing, Wi-Fi, some accessibility features, some audio devices, and some devices that connect via USB, Thunderbolt, or FireWire. Accelerated graphics are disabled, which could cause blinking or distortion onscreen during startup.
Your Mac and OS X have a variety of startup keys and key combinations you can use to affect how the device starts up. Shift key, for instance, starts your Mac in Safe mode, and C (or c) starts up from a bootable CD, DVD, or thumb drive. Command-S is for 'single-user mode,' which essentially means booting to the command line.
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Mac Os X Boot Usb
The Apple Key, or the Command Key
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. I'm betting many of you don't know them all, either, so here they are.
Boot Up Commands For Mac Os X 10 11
The links below point to other support documents on Apple's website.
15 Startup Key Combinations for Mac | |
---|---|
Hold during startup | Description |
Shift ⇧ | Start up in Safe Mode. |
Option ⌥ | Start up to Startup Manager. |
C | Start up from a bootable CD, DVD, or USB thumb drive (such as OS X install media). |
D | Start up to either Apple Hardware Test or Apple Diagnostics, depending on which Mac you're using. |
Option-D | Start up to either Apple Hardware Test or Apple Diagnostics over the Internet. |
N | Start up from a compatible NetBoot server. |
Option-N | Start up from a NetBoot server using the default boot image. |
Command (⌘)-R | Start up from OS X Recovery. |
Command-Option-R | Start up from OS X Recovery over the Internet. |
Command-Option-P-R | Reset NVRAM. Release the keys after you hear the startup sound again. |
Command-S | Start up in single-user mode. |
T | Start up in target disk mode. |
X | Start up from an OS X startup volume when the Mac would otherwise start up from a non-OS X startup volume. |
Command-V | Start up in verbose mode. |
Eject (⏏), F12, mouse button, or trackpad button | Eject removable media, such as an optical disc. |
Boot Up Commands For Mac Os X 10 12
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