MySQL does not start when upgrading OSX to Yosemite or El Capitan

Question

I know similar questions exist, such as MySQL with MAMP does not work with OSX Yosemite 10.10. However, I do have MAMP, nor XAMPP installed on my computer.

When I tr

Answer 1

Same happened to me! So I tried to startup again after I had terminated the running mysql application, and that worked!