HT204156: About the screens you see when your Mac starts up
Learn about About the screens you see when your Mac starts up
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Q: my computer stops about 2/3 of the way after the progress indicator starts and shuts down... any suggestion as to how to power it ... more
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Jul 18, 2016 4:05 PMby Carolyn Samit,HelpfulA Safe Mode boot deletes system caches that may help.
Follow these steps to start up into safe mode.
- Start or restart your Mac.
- Immediately after you hear the startup sound, press and hold the Shift key.
- Release the Shift key when you see the Apple logo appear on the screen.
After the Apple logo appears, it might take longer than usual to reach the login screen or your desktop. This is because your Mac performs a directory check of your startup disk as part of safe mode.
To leave safe mode, restart your computer without pressing any keys during startup.
Then try updating iTunes.
