// Quit MAMP. You may have to force quit when this happens as it does not shut down correctly.
// To show any MySQL processes currently running, open Terminal and from the command prompt run the command below.
pgrep mysql
// Next, kill the MySQL processes by running the command below.
pgrep mysql | xargs kill -9
// To verify they no longer exist, pgrep for mysql again and you should not have any processes returned.
pgrep mysql
// Now Launch MAMP again and MySQL Server should start normally.