I have my DNN installed, everything set correctly according to the documentation, and a site even shows up.  I can add/edit/delete users.  I can change the logo.  I can even change the layout, what modules are visible, etc.  But I can't add any content to the modules. 

Example: http://dnn.northminster-indy.org
You will see the errors.  Something interesting, as admin, the home page looks like this: (screenshot)
And as "host" it looks like this: (screenshot) - with a little more detail

I would love some help with this, and can give you an account if you want to get in, and see any settings.  I originally thought maybe there was a setting somewhere that allowed the admin to turn the ability to add new content on and off- but if there is I sure don't know where it is.  My SQL server is obviously running correctly, and I assume permissions are good too, because it installed itself form the install.aspx page.  The error that comes up when you attempt to add content, is identical to the error seen by the host, and listed below-

The error detailed for one particular module is:
Error: Announcements is currently unavailable.
DotNetNuke.Services.Exceptions.ModuleLoadException: Value cannot be null. Parameter name: connectionString ---> System.ArgumentNullException: Value cannot be null. Parameter name: connectionString at Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(String connectionString, String spName, Object[] parameterValues) at DotNetNuke.Modules.Announcements.SqlDataProvider.GetAnnouncements(Int32 ModuleId) at DotNetNuke.Modules.Announcements.AnnouncementsController.GetAnnouncements(Int32 ModuleId) at DotNetNuke.Modules.Announcements.Announcements.Page_Load(Object sender, EventArgs e) --- End of inner exception stack trace ---