Step 2: Enter the BIOS menu by pressing the right BIOS key (F1, F2, F8, F11, DEL). Step 1: Turn-off your PC and power it back on by pressing the "Power" button. In this case, you can simply change the Boot Mode back to UEFI by accessing the BIOS menu. In case, the boot sequence is accidentally changed on your PC, it won't load the required UEFI files and interrupt the booting process as well. UEFI is designed to support high-end hard drives and graphic cards. This is the advanced version of BIOS and can be found in almost every latest PC/laptop. UEFI is low-level software that's loaded before booting the operating system. Solution 1: Change the Boot Mode to UEFIĬhanging the boot sequence to UEFI has helped many users fix this particular error. However, if the error is caused due to a software-related issue, you can try the following different troubleshooting methods to fix it on your own. Being an electronic device, even a minor fall can have drastic consequences. It's worth noting that you can completely avoid this error by handling your PC/laptop with extreme care. Although you can call a technician, it's extremely challenging to repair a broken hard drive. In the case of physical damage, the only way to fix this error is to replace the hard drive with a new one. If you've accidentally dropped your laptop or hit the CPU (in case of a PC), chances are you might have damaged the hard drive inside. Bonus Time: How to Recover Data from the No Bootable Device?Īs we mentioned earlier, the " No Bootable Device" error is usually caused due to a damaged hard drive.Solution 3: Unplug CMOS Battery to Push the Device Back to Factory Settings. Solution 2: Reset the Boot Manager via Command Prompt.Solution 1: Change the Boot Mode to UEFI.This is pretty straight forward but it can be an unexpected hiccup if you’re trying to use a boot disk to install macOS, erase a drive, or perform other troubleshooting tasks.ĭid this resolve your Mac external boot disk booting issues? Did something else work for you? Did you find another solution or was there a different problem? Let us know your experiences, tips, and other boot disk matters that are on your mind by leaving a comment. This method of booting is unique to Apple Silicon Macs, and whether you want to boot into recovery mode on an M1 Mac or choose a different boot disk it is the same beginning procedure of holding the power button. Select the external drive you want to star the Mac from and choose Continue.Power on the Mac and then keep holding down the power button until you see the startup options screen.Booting an ARM M1 Mac from External Boot Mediaįor an Apple Silicon Mac, do the following to boot from an external drive: Using the OPTION key to load the boot menu and choose an external disk should work fine after this. The T2 chip is typically included with an Intel Mac that has a Touch Bar or Touch ID. Only Macs with a T2 chip need to do this. Reboot the Mac again, holding OPTION to boot from a boot disk should work now.Under the External Boot section, check the box for “Allow booting from external media” to prevent boot restrictions.Pull down the Utilities menu, then choose “Startup Security Utility”.Reboot the Mac, then immediately hold Command + R keys to load into Recovery Mode.If you’re finding the ability to boot a Mac from an external boot disk or other external media is disabled or not working as intended, read along to disable the security feature on T2 Macs or learn how to boot an M1 Mac from an external drive.Īllowing an Intel Mac to Use External Boot Media If this setting is enabled on a Mac, the computer will not boot when a USB boot disk or other boot media is used.Īdditionally, booting an M1 Mac from external boot disks is different from Intel Macs. Some of the later model Intel Macs have a security chip that offers the prevention of external boot media to be used to startup a Mac.
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