Magento 500 Internal Server Error

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I'm getting 500 Internal Server Error on checkout page, and want you to troubleshoot this problem and return functionality to the site.
The other pages seem to be working fine.
I've set up file permissions correctly, confirmed that Mage_Checkout was set to enable on System > Configuration > Advanced and tried uncommentting memory_limit of root .htaccess, but I still get this error.
Server error logs say something like this: [Sun Jun 26 23:27:57 2011] [error] [client IP address] client denied by server configuration: /home/mywebsite/public_html/app/etc/local.xml.
This job could be easy for experts.

Skills required:
Magento, PHP
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