If it's in vain, check if your internal hard drive has any errors and repair it with First Aid in Disk Utility. To make the internal hard drive mountable and show up again, you can click the Mount button in Disk Utility. So you can't see it in the Startup Disk window. Your internal hard drive has some errors, it greyed out in Disk Utility. The internal hard drive not mounted in Disk Utility Choose the reinstall macOS utility and then follow the instructions to reinstall macOS on the internal hard drive. If you accidentally deleted the Macintosh HD before reinstalling macOS, then it won't show up in the Startup Disk pane because you cannot boot up the Mac from a blank drive.Īt this time, you need to go back to the macOS utility window or similar. Here are three common reasons and solutions:

However, find that the Macintosh HD missing from Startup Disk.

Run the following command to launch iBoysoft Data Recovery for Mac through iBoysoft Server.

Select Utilities > Terminal in macOS Recovery mode.

Make your Mac connected to the Internet all the time.

Reboot your Mac and meanwhile, press the respecting keys based on your Mac model to boot into macOS Recovery mode.

Testdisk no hard disk found mac