Therefore, the Mac will display an error to tell you that it can’t find a working Mac OS. I f you installed any non-Mac operating system on the startup disk, the Mac may be confused when it is reading the disk at startup. Then select the drive which contains the Mac OS.Īre there other operating systems like Windows or Linux on the startup disk ? Then wait until the Mac boot into Recovery, click on Apple logo and choose Startup Disk. To solve the problem, what you need to do is to reboot the Mac and press down Command + R instantly before Mac boots up. As a result, the Mac shows up a folder with a flashing question mark telling it can’t find the bootup disk. When the Mac is turning on next time and it may try to find the external drive to boot from, but the external drive is detached. After that, you can try to reboot the computer normally.ĭid you boot up the Mac from an external drive before?įor testing or other purposes, some people may need to boot up their Mac from an external drive which contains a Mac OS. To solve the problem, you need to open up the Mac computer again to check all connections.
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