#What should I do if I can’t enter the system when I turn on my Mac?
1. Immediately after booting, press and hold the command R key to enter recovery mode.
2. Then select Disk Utility.
#3. Use Disk Utility to back up your computer data to your mobile disk.
4. Shut down the computer > Restart the computer > Press the command V key immediately to enter the code interface.
##5. Shut down > Restart> Immediately press the command R key to enter the macOS recovery interface, find the terminal tool in the upper left corner, and execute in the following order in the terminal command line Command (purpose: clear database cache).
#6. After completing the above operations: Re-enter the normal boot process. This boot may take longer than normal because the cache is cleared, about 3-5 minutes. .
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