If you have a bootable external drive, booting from that drive can also help you isolate problems or provide a different environment, such as a different version of OS X. Startup Manager may also help identify a flaky hard drive if the drive you’re looking for doesn’t appear in Startup Manager, you know you have a problem. However, you can also use it to force a boot from your primary drive if your Mac is stubbornly booting from another disk. Startup Manager is primarily useful for booting from an alternative drive, like a system clone, USB thumb drive, or a Boot Camp partition. Press and hold Option as your Mac boots to enter the Startup Manager, which lets you select which disk to boot from. Option: Invoke Startup Manager - The first startup key every Mac user should know is the Option key. Not all are useful on today’s Macs, but we wanted the list to be complete. Here are fifteen startup key combinations that can save the day when things go wrong. When the proverbial manure hits the fan and prevents your Mac from booting as you want, knowing the right startup key combination can save the day, whether you boot into Safe Mode, Recovery, Apple Diagnostics, or from another disk entirely. #1622: OS feature survey results, Continuity Camera webcam preview, OWC miniStack STX.#1623: How to turn off YouTube's PiP, use AirPlay to Mac, and securely erase Mac drives.#1624: Important OS security updates, rescuing QuickTake 150 photos, AirTag alerts while traveling. #1625: Apple's "Far Out" event, the future of FileMaker, free NMUG membership, Quick Note and tags in Notes, Plex suffers data breach.
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