Problem and SOLUTION explained below :

[root@myserver]# /etc/init.d/httpd start
Starting httpd: (98)Address already in use: make_sock: could not bind to address [::]:80
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs
[FAILED]
[root@myserver]# fuser -k -n tcp 80
80/tcp: 19594
[root@myserver]# /etc/init.d/httpd start
Starting httpd: [ OK ]
[root@myserver]#