Sometimes, due to the existence of duplicate installations, software updates or etc., the Mysql database will not start when you first open Mamp. Fortunately there is a quick and easy solution!
- Using Finder, head to the Applications folder
- Select the Mamp folder
- Choose the database folder (db)
- Select the Mysql folder (sometimes there will be a version number next to the name)
- Delete the log files (ib_logfile0 and ib_logfile1)
- Restart Mamp - you should be able to access your website without issue!