its not really important to upgrade to ver5 but now doesnt mysql start at all
Reboot and it should restart.
Have a look at this post..
http://forums.contribs.org/index.php?topic=33434.msg143545#msg143545
and try the how-to to get around the php-domxml problem.
found another post in this forum.
Guess what dudes??...YES .. its working..my webmail, server-manager..ffs everything works!!!
good job everyone involved