Could you describe the steps you performed in order to set up your site?
From your comments, it seems you have a running Joomla site and you tried to move to a Bitnami Joomla! installation.
Did you just copy your previous site in one of the Bitnami Joomla! installation? If so, could you describe how did you perform that migration?
Otherwise, could we take a look at the public IP so we can see the errors in the browser console? Could you share with us the apache logs (just the lines after a single access)?
Since you already fix the permissions, this information could be useful to help you.