I recently had to install MAMP Pro, in order to do some separate work from my Laravel Homestead VM.
After a weird Mac crash, MAMP would no longer start the MySQL server. This was the data from the logs:
To fix this, go to MAMP, File > Edit Template > MySQL > [version] and add the line highlighted below.
# The MySQL server
[mysqld]
innodb_force_recovery = 1
The restart the server. After this you can comment out that line. Hopefully you will now be able to run the server again.