Please see the error logs and .htaccess file
============== ERROR LOG ==============
www.myucl.com[Sun Aug 14 02:16:08 2011] [error] [client 66.249.67.25] File does not exist: /home/myucl0/public_html/500.shtml
[Sun Aug 14 02:16:08 2011] [error] [client 66.249.67.25] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/myucl0/public_html/forumdisplay.php
[Sun Aug 14 02:15:58 2011] [error] [client 66.249.68.68] File does not exist: /home/myucl0/public_html/500.shtml
[Sun Aug 14 02:15:58 2011] [error] [client 66.249.68.68] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/myucl0/public_html/viewthread.php
[Sun Aug 14 02:15:48 2011] [error] [client 123.125.71.111] File does not exist: /home/myucl0/public_html/500.shtml
[Sun Aug 14 02:15:48 2011] [error] [client 123.125.71.111] (12)Cannot allocate memory: couldn't create child process: /opt/suphp/sbin/suphp for /home/myucl0/public_html/viewthread.php
[Sun Aug 14 02:15:39 2011] [error] [client 220.181.125.70] File does not exist: /home/myucl0/public_html/500.shtml
============= .HTACCESS ==========
# AddHandler application/x-httpd-php5 .php5 .php4 .php .php3 .php2 .phtml
AddType application/x-httpd-php5 .php5 .php4 .php .php3 .php2 .phtml
<Files 403.shtml>
order allow,deny
allow from all
</Files>
deny from 220.170.248.53
deny from 124.205.137.162
deny from 119.126.199.14
deny from 120.33.185.34