It seems that installing a Drupal site (or copying one from your dev machine) to a ONE.COM hosting is not without troubles….

As soon as you have put in place your database (via phpmyadmin), copied your files via ftp and updated your settings.php file (you need to do this at least to check your database connection), you will most probably get:

500 Internal Server Error

This can be solved quite easily by commenting two lines in your .htaccess file:

# Don't show directory listings for URLs which map to a directory.
Options -Indexes
# Follow symbolic links in this directory.
Options +FollowSymLinks

So, after changing your .htaccess, it should look like this:

# Don't show directory listings for URLs which map to a directory.
# Options -Indexes
# Follow symbolic links in this directory.
# Options +FollowSymLinks

After doing this, your site should run smoothly.