Messed up directory permissions - "500 Internal Server Error"

I'm a complete newb when it comes to Linux and tried to chmod (777) a folder and its directories. However, unknowingly, the folder was labeled $internal_c. For whatever reason the folder name was nulled out...

So, I have modified permissions to 777 throughout the server. (Yes, I was logged in as root. Don't shoot me)

Now, I have a 500 internal server error when trying to access Plesk and no SSH connection.

Unfortunately, it's a godaddy dedicated server and I'm trying to provide them some information to at LEAST get me SSH again.

Could anyone help me find a listing of the directories plesk uses and the permissions for them? Is there a general permission set or do certain files/directories require different permissions?

Any help would be greatly appreciated. Thanks.