Microsoft Windows , macOS , Android and Linux distributions such as Ubuntu and Linux Mint are examples of contemporary operating systems that implement a safe mode called "Safe Boot" in macOS as well as other complex electronic devices.
How to boot in safe mode? - Apple Community
In safe mode, an operating system has reduced functionality, but the task of isolating problems is easier since many non-core components are disabled, such as sound. An installation that will only boot into safe mode typically has a major problem, such as disk corruption or the installation of poorly-configured software that prevents the operating system from successfully booting into its normal operating mode.
Though it varies by operating system, safe mode typically loads only essential executable modules and disables devices except for those necessary to display information and accept input. It can also take the form of a parallel "miniature" operating system that has no configuration information shared with the normal operating system.
For example, on Microsoft Windows, the user can also choose to boot to the Recovery Console , a small text-based troubleshooting mode kept separate from the main operating system which can also be accessed by booting the install CD or to various "safe mode" options that run the dysfunctional OS but with features, such as video drivers, audio, and networking, disabled. Safe mode typically provides access to utility and diagnostic programs so a user can troubleshoot what is preventing the operating system from working normally.
Mac OS X - Troubleshooting Startup Problems
Safe mode is intended for maintenance, not functionality, and it provides minimal access to features. However, under Windows 8 released in , the traditional press-F8-for-safe-mode-options UI convention no longer works, and either Shift-F8 or a special GUI-based workaround is necessary. An equivalently minimal setting in Unix-like operating systems is single-user mode , in which daemons and the X Window System are not started, and only the root user can log in. After the Disk Utility operations are complete, restart without holding any keys. Check your cables and power source Make sure your power cables are secure especially if you use a desktop Mac.
Try a different cable or outlet if possible. If you use a surge protecter, try connecting directly to an outlet as a test. If you have power-related issues such as your desktop Mac shutting down or restarting, or room lights dimming, when an appliance comes on, consider contacting a certified electrician to check your outlets and electical wiring. Remove any non-Apple RAM or other third-party hardware upgrades such as expansion cards or third-party optical drives or hard drives, if present to help isolate the issue. This is necessary to get as close as possible to the original factory hardware configuration of your Mac.
Mac OS X 10.4.2 Special Report: Problems starting up/shutting down
If you are not sure about which RAM modules or other hardware is Apple or third-party, or if you are not comfortable performing these steps, or if you have a Mac mini, consider contacting an Apple Authorized Service Provider for assistance. Otherwise, perform these steps before going to the next section. Open your Mac to access the memory slots.
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Remove any third-party RAM that has been installed. Reinstall the Apple RAM that came with the computer if available. Note that Mac OS X Perform an Archive and Install installation preserving users and network settings.
After installation, if the gray screen issue persists, go to the next section. Perform an Erase and Install installation of Mac OS X as a last resort Important : You should only perform this step after trying all of the above steps.
There are times when your Mac may misbehave and refuse to boot into OS X.
This process will erase all files from your Mac OS X volume. If possible, back up important files first, or use Time Machine.
You may be able to connect your Mac to another Mac with a FireWire cable and FireWire target disk mode, in order to try to manually back up files. Alternatively, you may wish to make an appointment with a Mac Genius at an Apple store, or contact an Apple Authorized Service Provider for assistance. Additional Information If the issue persists after following the above steps, you may wish to make an appointment with Miss Mac.
The issue may be that peripherals A and C have a conflict of some sort, and a gray screen only appears if they both are connected, but not if each one is connected separately. Select a tool and click Continue to perform the desired function. Keywords: tiger snow leopard mountain lion can't cannot startup gray screen shift key safe mode boot recovery partition restart login Self Help Only.
These instructions are provided for self help purposes only.