farainechz wrote:
I cant even get to start the mac in safe mode, the screen will repeatedly turn black, and display my accounts to enter password, when I try to select account/enter passwork, screen turns dark (sort of like blinking) again and so Im stuck there until I restart in normal mode.
Uninstall any and all third party Antivirus, Cleaners, Optimizers, VPN, speeder uppers....
all known to cause issues on the macOS.
To trouble shoot further you can:
—Test issue in another user (or guest user) account Change Users & Groups settings on Mac - Apple Support
This will tell you if it a universal issue or isolated to your user/admin account.
No insight or resolve—
Erase and reinstall macOS - Apple Support - Erase and reinstall macOS - Apple Support
alternative:
Revive or restore an Intel-based Mac using Apple Configurator - Apple Support