Fix Mac startup problems or update problems

If there are problems with the Mac startup process or a MacOSThe operating system macOS , previously Mac OS X and OS X , is the operating system from the Californian hardware and software company Apple for laptop and desktop computers of the Mac series. https://de.wikipedia.org/wiki/MacOS mehr erfahren update cannot be installed, the following has often helped us:

Use secure mode

1. Turn on your Mac or restart it, then immediately press and hold the Shift key while the Mac starts up.
2. Release the button when the login window appears and then log in to your Mac.
3. You may be asked to log in again. Either in the first or second login window, “Secure system start” should be displayed in the top right-hand corner of the window.

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