Mac OS X MySQL Won't Start

If you ever update MySQL on your Mac (I thought I would run 3.23 forever too), and have an issue starting it up, delete the updated version and the receipt directory in /Library/Receipts and reinstall. It will work fine after the reinstall. Since I'm really not up to the task of re-permissioning lots of things in mysterious ways, reinstalling does wonders.

References:

• The macosxhints Forums - (re)installation mysql
Entropy Forum Post
• Another MacOSXHints.com Forum Post