Rails Hosting Problem

Hi there,
I have recently created my first Rails application and I am trying to
get it online, I have all the files on the server and I have changed to
production mode,
I have updated the gems that were needed for the host.The problem I am
having is,
I keep getting a 404 error? I cannot figure out what lines of code I
would need to change to get it running? anybody have any ideas?

My routes.rb file reads:

ActionController::Routing::Routes.draw do |map|
  # The priority is based upon order of creation: first created ->
highest priority.

  # Sample of regular route:
  # map.connect 'products/:id', :controller => 'catalog', :action =>
'view'
  # Keep in mind you can assign values other than :controller and
:action

  # Sample of named route:
  # map.purchase 'products/:id/purchase', :controller => 'catalog',
:action => 'purchase'
  # This route can be invoked with purchase_url(:id => product.id)

  # You can have the root of your site routed by hooking up ''
  # -- just remember to delete public/index.html.
  # map.connect '', :controller => "welcome"

  # Allow downloading Web Service WSDL as a file with an extension
  # instead of a file named 'wsdl'
  map.connect ':controller/service.wsdl', :action => 'wsdl'

  # Install the default route as the lowest priority.
  map.connect ':controller/:action/:id.:format'
  map.connect ':controller/:action/:id'
end

Thank You,
Dave

Your routes.rb file isn't the problem if you get a normal 404 error.
What's your .htaccess file look like, and where is it?