A general understanding how your system loads can provide the basics needed to understand what is going on when you use boot media. It provides guidance that is specific to the iteration of OS X you are running i.
Sierra, High Sierra, Yosemite, etc. Windows and Linux users might consider Acronis Disk Director 12 , which includes an intuitive Boot Media Builder that streamlines the process and offers tremendous flexibility for the type and kind of boot media you can create, including WinPE media. All rights reserved. Acronis Disk Director Learn more day free trial.
Mac Startup and Software problems
Once the Startup Manager screen appears, release the Option key. The utility will look for any available drives that include bootable content. Using either the pointer or arrow keys on the keyboard, select the USB drive you wish to boot from. Once selected, either hit the Return key or double-click your selection. It disables custom user-installed fonts and clears a number of macOS system caches too. This can make it hard to attempt a fix. It's called Apple Service Diagnostic, and we'll show you how to get it and use it for best results.
This is ideal if you have problems with your hard drive or recovery partition. This includes date and time, volume, desktop settings, and so on.
Clearing the PRAM
Shut down your Mac, power it up, then immediately hit the key combination above. Wait till your Mac reboots again, then let go of the combination. Most Apple computers use the combination of keys provided above, but some models require you remove batteries or remove the power cord instead. Recovery mode is your ticket to solving many macOS problems from a friendly environment.
Here's a troubleshooting guide to help get your external hard drive or flash drive working again. Later you also may want to restore it. Here's how to do both.
If you want to transfer files from one Mac hard drive to another, Target Disk mode makes it simple. By starting a Mac in Target Disk mode, you can connect it to another Mac and copy files to and from the drives.
Fix Mac Won't Boot/Start after macOS High Sierra Update
In essence, it turns your Mac into a hard drive enclosure. Apple states you can use:. Here's everything you need to know about your MacBook ports. Single User mode boots your Mac into a minimal text-based environment with no GUI, and no drive volumes mounted on startup. About Me. My Services. Word-of-Mouth Reviews.
Apple Macintosh Boot Key Combos
Trust-Pilot Reviews. True-Local Reviews. Toggle navigation. Mac Startup and Software problems - Troubleshoot. Step through the following points: Does the system turn on? Disable extensions on boot Power on or restart the computer while holding down the [shift] key. Use the Boot menu Power on or reboot the computer while holding down the [option] key. Use Verbose mode Power on or reboot the computer while holding down the letter [V].
Does the Mac make any noise? This can indicate a corrupt installation of Mac OS X or a failed or failing hard drive. Apple logo with spinning gear Once the spinning gear appears the BSD kernel Darwin has become operative and begins loading device drivers.
Kernel Panic A kernel panic is an Operating System crash. Mac crashes have various appearances — the Spinning Beach Ball being perhaps the most familiar — or a screen slowly darkening from top to bottom before a multilingual warning appears image below : A kernel panic can happen at virtually any point in the boot process and may indicate a corrupt OS, an incompatible kernel extension, or a hardware problem. You can also use a clone of your Mac hard drive to boot a faulty system. This not only allows you to check, fix or copy data off the primary boot drive but continue working immediately when you have disk problems.
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