Removed the old installation as explained here:
Installed the package contained in the mysql 5.1.67 DMG downloaded from MySql.com Installed the preference pane item Installed the startup item [THIS FAILED]
MySql will not load, it's preference pane show the error message displayed below:
The MySql database server installation was not found. Please make sure the /usr/local/mysql/bin/mysqladmin file is present
I don't have much familiarity with unix commands so I'm not clear how to troubleshoot this further.