MySQL Server will not start

[SeanF]

For some reason, MySQL won't start all of a sudden.

I am running XAMPP 5.6.3-0 on a MacBook Pro MacOS 10.9.5.

Today when I start "Application Manager" and "Start All" servers, the lights for Apache and ProFTP go green. The light for MySQL Database changes to yellow but after a minute or so, changes back to red.

I have restarted the computer but the problem persists.

The system has been running fine for two years and, as far as I know, nothing about XAMPP has changed to cause the problem.

I am not sure what I should be looking for as a potential problem.

Does anyone have a suggestion?

Thanks