new server with 7.3 and cpanel

i have test all domain , email ,php,mysql all work but just cgi error 500 , i have chmod all to 755 also not work, i have run some cgi program in different server , just new server don't work.

what can i do now?

also need to know how to install gd for php?
some customer need to use more module for php!

and what system service can stop it!

for not runing cgi server i just open this for server

"ntsysv"
atd , crond , httpd , ipop3 , iptables , keytable , mysqld , named ,
network , proftpd , random , sendmail , sshd , syslog , webmin ,
xinetd

so what service can i stop for cpanel server

cPanel.net Support Ticket Number: