If you have added your domain to your cPanel account and is redirecting to cgi-sys/defaultwebpage.cgi please wait 24 hours as it can take up to 24 hours for a domain to fully propagate throught the world.
If you are still having issues after a full 24 hours after adding the domain then feel free to contact support.
Not Recomended but is a plausable fix,
If the page continues to redirect and you do not use CGI code on your site you can create a .htaccess files and insert the following,
<IfModule mod_rewrite.c> Options -ExecCGI </IfModule>
Again, Not recomended but could work.