can't reboot
The computer is turned on normally. The device goes off and restarts itself. Once the Apple logo is up (booted but not finished), the screen is white and the device turns off.
MacBook Pro 15", macOS 10.12
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If your Mac turns on but doesn't finish starting up, one of these solutions might help. If you need to turn off your Mac first, press and hold the power button for 10 seconds.
- If your Mac starts up to a question mark, circle with a line through it, or something other than your desktop, learn about the screens your Mac displays as it starts up.
- If the issue occurs after logging in to your user account, test the issue by logging in to another account, if available.
- Start up from macOS Recovery. If the only way that you can start up is from macOS Recovery, the operating system on your startup disk might no longer be usable. In that case, reinstall macOS or restore from a backup.