Mac os x safe mode boot

Using Safe Boot Mode in Mac OS X

Safe Mode boots Mac OS X differently than normal boot mode, disabling some features, dumping some caches, preventing third party kernel extensions from loading into Mac OS X, amongst other reductions in overhead on the Mac, including the following:. These features are helpful for troubleshooting a problematic Mac, because if a Mac functions fine in Safe Mode but things are acting up or going wrong during a normal system boot, something is obviously going wrong with what is loaded during the normal startup process.

Basically, safe mode helps you to narrow down the cause of what is erring the Mac. If you ever get a blank grey or blue screen after running a System Update, booting into Safe Mode will often resolve this by deleting the caches, then simply reboot again to be returned to normal.

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That can also apply to seeing those screens when booting with certain drives and volumes mounted. Enjoy this tip? Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! Enter your email address below:.

Mac always booting into Safe Mode? Here are ways to troubleshoot it | Macworld

Pages software kept crashing as soon as opened. This guide will aim to fix a Mac that keeps booting into Safe Mode and return it to normal boot functionality. There are a few reasons why a Mac may always be booting into Safe Mode. You might want to use compressed air and blast around the shift keys on the keyboard to make sure nothing is lodged underneath it.

Checking for stuck keys is particularly important for the often problematic keyboard featured on the MacBook Pro lineup and the MacBook line, where the keyboard keys are notorious for getting stuck or jammed, whether by tiny particles of dust or debris, or seemingly at random. By the way, if you do have MacBook Pro or a MacBook, Apple has a keyboard repair program available here to replace and repair problematic keyboards currently the MacBook Pro is not on that keyboard service repair list, but given that the keyboard is basically the same and various reports indicate the keys are sticking on the models too, that may change.

This is performed right away when the Mac boots up and it will often resolve issues like when a Mac keeps booting into Safe Mode. This can remedy a variety of situations where a Mac is booting into Safe Mode constantly, whether by error or intentional, for example if you or someone else had enabled Safe Mode from the command line by configuring nvram boot-args, resetting the NVRAM should clear that configuration adjustment out too.

Usually the two steps above, cleaning and inspecting the keys combined with resetting NVRAM, will resolve any issues with a Mac being stuck booting into Safe Mode every boot. If for some reason the problem persists, some other troubleshooting steps could be:.

Did the steps outlined above fix your Mac and stop it from always booting in Safe Mode? Do you have another helpful troubleshooting method to resole this issue?

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Share your experiences in the comments below! Enjoy this tip? Subscribe to the OSXDaily newsletter to get more of our great Apple tips, tricks, and important news delivered to your inbox! Enter your email address below:. When I start my iMac in safe mode, everything I try to do on the screen is interrupted by a cascading effect; the screen is constantly refreshing.

How can I fix this? I have tried everything.

Reasons to start your Mac in Safe Mode

To leave safe mode, restart your Mac without pressing any keys during startup. If an issue doesn't happen in safe mode If an issue doesn't happen when your Mac is started in safe mode, try restarting without pressing any keys.

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  • If the issue doesn't come back, it was probably caused by a cache or directory issue with your startup disk, which safe mode fixed. If your Mac restarts or shuts down in safe mode Your Mac automatically checks the directory of your startup disk when you start up in safe mode. Some features aren't available in safe mode Some features of your Mac aren't available when it's started in safe mode: You can't play movies in DVD Player.

    Start up in safe mode

    You can't capture video in iMovie and some other video apps. Some audio input or output devices might not work. Wi-Fi networking might be limited or unavailable, depending on the Mac and macOS version you're using. Accessibility features like VoiceOver might not work as expected. File sharing is disabled.

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