When open your website shows an "Internal Server Error"  you want to check in your apache error log using tail command,

#  tail -f /usr/local/apache/logs/error_log  | grep yourdomain

[Tue Mar 12 12:07:18.442020 2014] [core:error] [pid 1230011:tid 156751157909248] [client] AH00124: Request exceeded the limit of 10 internal redirects  due
to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer: http://yourdomainname.com/

Most probably you have received an error by .htaccess in wordpress, check your basic page redirection like below,

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]