if chkconfig worked, then you can see which services are starting at each runlevel (1,2,3,4,5,6)
you can add a service to start at level 3 by doing:
/sbin/chkconfig add 3 apache
I dont have mandrake on this machine, so I can't tell you exectly. But that is the basic ided. /sbin/chkconfig --help will give you the exect syntax.