Try:
Code:
chkconfig --list ptal-init
If ptal-init features in it, then issue:
Code:
chkconfig --level 2345 ptal-init off
This would disable the service startup in levels 2,3,4 & 5. Check the man page for your exact requirement.
In case your dont have chkconfig, try checking netsysv for service management.
HTH.