If you are using MAMP PRO 5.7+ (18029)
1.Just stop MAMPRO. 2.Goto to directory /Applications/MAMP/db/mysql## (Where ## is the Number of your Mysql version) 3.List the files with command: ls -l * 4. Type command: rm ib_logfile* #Just must delete theses 2 files. 5.Restart MAMPRO and its must works fine!
Caution: If you remove the files ibdata1 will destroy all you "databases"