To check what starts on start up do chkconfig [servicename]

or chkconfig --list to see whats going on

or do chkconfig [servicename] on for one that is off

EX # chkconfig ssh on

There are runs levels or boot modes that may need attention:

EX:postfix 0:off 1:off 2:on 3:on 4:on 5:on 6:off

Levels 5 is gui mode; 3 is shell boot mode, so anywhere from 2~5 is good.