MySQL does not start on startup
There should also be logs in /usr/local/mysql/data. You'll have to "sudo su" from a Terminal session in order to see that directory. Check for any errors being reported in a filed named like this: "Your-computer-name.local.err"

Report back whatever you see that doesn't make sense.

You can also check out the startup script to make sure there are no errors. Find that here: /Library/StartupItems/MySQLCOM/MYSQLCOM