Tried to update to Catalina now my MacBook Pro cycling off and on HELP
I tried to update to Catalina now my MacBook Pro keeps cycling off and on . The keys do nothing. Help
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Reinstall El Capitan or Later Without Erasing Drive
Please be sure you back up, if possible.
- Restart the computer. Immediately, at or before the chime, hold down the Command and R keys until the Apple logo and progress bar appear. Wait until the Utility Menu appears.
- Select Disk Utility and click on the Continue button.
- Select the indented (usually, Macintosh HD) volume entry from the side list.
- Click on the First Aid button in Disk Utility's toolbar. Wait until the Done button activates, then click on it.
- Quit Disk Utility and return to the Utility Menu.
- Select Install OS X and click on the Continue button.
If this isn't helping then How to Downgrade from macOS Catalina to Mojave or Earlier.