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-as of [15 NOVEMBER 2024]-
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*SAFE MODE 101*
*official link*
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*INSTRUCTIONS* –>
(for ‘macs’)
(press and hold ‘shift key’ as your ‘mac’ boots)
(let go of ‘shift key’ when you see ‘apple logo’ + ‘startup progress bar’)
(to get out of ‘safe mode’ just reboot your ‘mac’)
(you will be notified on the initial ‘macOS login screen’ when you are in ‘safe mode’)
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–“safe mode” is a ‘diagnostic mode’ of a ‘computer operating system’ (OS)-
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(it can also refer to a ‘mode of operation’ by ‘application software’)
(safe mode is intended to help fix most (if not all?) problems within an ‘operating system’)
(it is also widely used for removing ‘rogue security software’)
(in ‘macOS’, holding the ‘shift key’ after powering up activates ‘safe boot’ that has ‘background maintenance features’)
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(besides the ‘mode selection’, it runs a ‘file system repair’, and in ‘Mac OS 10.4’, it…)
*disables all ‘fonts’ other than those in /System/Library/Fonts*
*moves to the ‘trash’ all ‘font caches’ normally stored in /Library/Caches/com.apple.ATS/(uid)/, where (uid) is a user ID number such as 501*
*disables all ‘startup items’ + any ‘login items’ + can reset an administrative account’s ‘password’*
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(unlike in ‘windows’ (where ‘safe mode’ with ‘networking’ is disabled by default + requires using a ‘safe mode’ with networking enabled), in the macOS, ‘safe boot’ always includes ‘networking’)
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(on the ‘classic Mac OS versions 6 / 7 / 8 / 9’, a similar mode to the ‘unix root’ is achieved by holding down the ‘shift key’ while booting, which starts the system without ‘extensions’)
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Safe mode can help you to determine whether an issue is caused by software that loads as your Mac starts up.
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.
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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.
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How to use safe mode
Apple silicon
Shut down your Mac.
Press and hold the power button for 10 seconds as your Mac starts up.
Release the power button when you see startup options window.
Select your startup disk, press and hold the Shift key, click Continue in Safe Mode, then release the Shift key.
Log in to your Mac.
You might be asked to log in again.
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Intel processor
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.
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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.
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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.
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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.
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If updating your software doesn’t help, try any of these solutions:
Test your login items.
To learn whether software in your user account is causing the issue, set up a new user account, then log in to it and try to reproduce the issue in that account.
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.
Reinstall macOS.
If you still need help, please contact Apple Support
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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.
Published Date: November 17, 2020
support.apple.com /en-us/HT201262
How to use safe mode on your Mac
4-5 minutes
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