What to do when Mac OS X Yosemite won't boot - Macintosh How To
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Solved!] MacBook Pro/Air/iMac Won't Boot Past Apple Logo!
Troubleshoot Your Mac With These Hidden Startup Options
About Startup Security Utility on a Mac with the Apple T2 Security Chip - Apple Support
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How to Boot a Mac from an External Drive or Alternate Startup Disk | OSXDaily
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install - iMac won't boot off of Mavericks USB when downgrading from Yosemite - Ask Different
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How to Boot Mac from USB | Mac Won't Boot from USB Troubleshooting
How to Make Your Mac Boot From a USB Drive
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