There are times when your Mac may misbehave and refuse to boot into OS X.

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.

Change the Mac Startup Drive on Boot

The machine will start to boot from the USB drive. Boot from USB: Then t o change the BIOS boot sequence: Press the Power button for your computer. Depending on the company that created your version of BIOS, a menu may appear. All of the available system devices will be displayed in order of their boot priority. You can reorder the devices here. Move USB to be first in the boot sequence.


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The computer will restart using the new settings, booting from your USB drive. Stay alert!

Use any of these 3 methods to get your Mac up and running

If you do nothing, your computer will go to the next device in the boot sequence list, which will likely be your hard drive. A Macs startup drive can be changed during system boot by holding down the OPTION key , start holding down Option the moment you hear the boot chime sound and while the screen is still black, this will bring up the boot drive manager.

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From this startup boot disk menu, you can use the mouse or the arrow keys to select the drive or partition to boot from, and then either click or hit return to startup the Mac from the chosen boot volume. This allows for a per-boot one time selection, and selecting a boot drive from this menu will not change your default boot drive.


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  6. This should probably go without saying, but in order for the multi-boot startup menu to appear and work as intended, the Mac must have multiple bootable volumes. This can be the primary Macintosh HD partition and the Recovery partition, or the primary Mac HD partition, a secondary OS X installation, a bootable installer drive, an external drive , or any other boot volume.

    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:. But I dont see recovery Disk, I know this will include with Lion. Running OSX I tried several passwords, but none worked.

    Has anybody else ran into this?

    How Can I Repair My Hard Drive If My Mac Won't Start?

    I set up the windows 7 on my Imac, and then it goes win 7 without changing. How do I change OSX automatically? The Mac will show all boot volumes by holding the Option key on startup. My startup is stuck on network startup. How do you fix this. That is the only wait to change the Mac startup drive on boot.

    How To: Boot Mac OS From An External SSD

    In addition to news, opinion and information, Apple World Today provides resources for deals, software updates and more. Feb 19, Here are some basic keyboard shortcuts for iOS Feb 18, Use Startup Disk preferences When you use Startup Disk preferences to select a startup disk, your Mac starts up from that disk until you choose a different one. Select your startup disk, then restart your Mac.

    Use Startup Disk preferences

    Use Startup Manager When you use Startup Manager to select a startup disk, your Mac starts up from that disk once, then returns to using the disk selected in Startup Disk preferences. Hold down the Option key immediately after turning on or restarting your Mac. Release the Option key when you see the Startup Manager window.