If you've recently upgraded to macOS Sequoia 15.0 and are experiencing issues with MySQL not running, you're not alone.The root cause lies in the significant architectural changes introduced in MySQL 9.0.Here's the solution, broken down into actionable steps: Stop MySQL 9.x, Install MySQL 8.4, Start and Stop MySQL 8.4, Start MySQL 9.x, Remove MySQL 8.4By following these steps, you can resolve the MySQL startup problem on macOS Sequoia 15.0.