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  1. Jun 3, 2024 · 1. Select Correct Boot Drive from Startup Manager. When your Mac throws the “No Bootable device” error, perform the following: a) Press the power button for some time to force shut down your Mac. b) Power on your Mac, then immediately press and hold the Option key. c) Release the key when the Startup Manager opens. Image: Startup Manager.

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  2. Sep 26, 2023 · Specifically, it means that your Mac attempted to boot from its designated startup disk, but was unable to locate a valid System folder or boot files on that disk. Without these critical files, the Mac cannot finish the boot process and load the operating system.

  3. Feb 2, 2023 · To force your Mac to boot, press and hold the power button for about 10 seconds. After about 10 seconds, release the power button and then press it again normally. This will force your Mac to ...

  4. Aug 30, 2021 · If your Mac still won’t boot, make sure that your preferred startup disk is selected in Startup Disk preferences. Shut down your Mac and then turn it back on. Right after you press the power button to boot your Mac, press and hold the OPTION key. Use the arrow keys to select the startup disk that you would like to boot into.

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  5. Sep 15, 2013 · I had deleted my Bootcamp partition before I reset my startup disk to my the one for Mac OS. On computer start up, I get the "No bootable device -- insert boot disk and press any key" message. I have tried suggests like hold down the option key during start up, and hold down command-R during start up.

  6. Nov 26, 2022 · Connect the USB to the computer. Press Command + Space, type Disk Utility and open the application. Select the USB drive from the menu. Click on the Erase tab from the ribbon bar. Change the file system Format to Mac OS Extended (Journaled) and set the scheme to GUID partition Map. Finally, click on the Erase.

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  8. Aug 10, 2019 · Here’s how. Make sure your Mac is shut down. Hold down the Command + R keys. Power up your MAc. At this point, the Apple logo should pop up on your display. Once you see the Recovery Mode pop up, select Disk Utility from the OS X Utilities menu. Select the disk or partition that you have macOS installed on.

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