Try running /etc/rc.d/init.d/crond stop
then /etc/rc.d/init.d/crond start
See what the results are, it could just be disabled, if so simply add the line to /etc/rc.d/rc.local at the very bottom:
/etc/rc.d/init.d/crond start
This probably isn't the most 'clean' way of doing it but it is the easiest and fastest.
The cleanest way would be to create a symbolic link in /etc/rc.d/init.d/rc7.d
Ya'll correct me if I am wrong.
Thanks,
Nathan Fowler