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Error: Database connection failed. It is possible that the database is overloaded or otherwise not running properly. The site administrator should also check that the database details have been correctly specified in config.php

Never thought this would happen outside of Moodle but with ELGG it did! I couldn't get MySQL back up after restarting MacMini.

I'm still stuck. One possible solution is here:

http://diymacserver.com/2007/10/31/mysql-has-some-issues-with-leopard/

but it didn't solve the problem. Other people working on the problem:

http://bugs.mysql.com/bug.php?id=31889
http://www.robbyonrails.com/articles/2007/10/27/starting-mysql-after-upgrading-to-os-x-leopard