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OS X includes a boot option called Safe Mode. Start up your machine while holding down the Shift key to have OS X only load required kernel extensions and login items. It will disable all non system fonts, all startup items, and login items.
How to Use OS X Boot Options to Troubleshoot Your Mac | TechRadar
If you are having OS X boot problems, always try this first to check and see if you have a rogue piece of software preventing your Mac from booting properly. Check out this article for more information about booting into Safe Mode. Using this key combination will cause your Mac to become very verbose on startup and will show a terminal-like interface while booting.
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It will contain information important to startup, allowing you to diagnose startup problems by seeing any errors that may be occurring during startup. Verbose mode exits automatically when the computer's startup process progresses sufficiently and the blue screen appears. This is a terminal interface that allows you to login and interact with your computer via text input only. No graphical interface will be loaded.
This mode is good for when you need to troubleshoot a startup issue, or modify a file or application that is preventing proper startup.
1. Press C During Startup
In this mode, you can use Safari to browse the web for any possible boot problem solutions, perform a system restore, or format the drive using Disk Utility. For more information about using Lion's Recovery Mode features, check out this previous article. Cory Bohon is a freelance technology writer, indie Mac and iOS developer, and amateur photographer. Follow this article's author, Cory Bohon on Twitter. Press Option During Startup Holding down the Option key during startup will show you a boot screen with all bootable devices listed. Press N During Startup If your setup includes a compatible network server NetBoot , you can hold down the N key during startup to attempt a network boot.
Stay safe online by getting the best Mac VPN. Highlight the volume you want to use by using your mouse or trackpad, or left and right arrow keys on the keyboard.
Use the Mac's Boot Manager to Eject a Stuck CD/DVD
Step 4: Double-click or press the Return key to boot your Mac from the selected volume. If there are several USB storage devices connected to your Mac, Startup Manager will only list the ones containing bootable volumes. Full tutorial: Now click the Startup Disk pane. You will be presented with various disk icons.
Now click the Restart button to start up your Mac using the chosen volume. Should you run into problems whilst attempting to boot your Mac from an external storage device, consult our FAQ below to help troubleshoot any start up issues you may be plagued with. Depending on its model and power requirements, it may be necessary to connect your USB storage device to an external power supply.
Make sure your external storage is turned on and connected to your Mac. In the worst case scenario, you might need to reinstall OS X on the external volume.
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Using an external hub to connect several USB storage devices may cause your Mac to fail to recognize them at boot time. Try connecting the USB drive to another port on the hub.